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Production Knowledge · Members

Factory-grade apparel knowledge, in SpecForm’s voice

109 original reference articles across textiles, merchandising, the cutting room, production, IE & Lean, trims and trade finance. Previews are open to everyone; full articles and the data visuals unlock for SpecForm members.

Textile

6 articles

Fabric Knowledge for Merchandisers: The Complete Map

Fabric is 60–70% of a garment's cost, so getting it right is the biggest lever on price and quality. The full map of what a merchandiser needs to know about fabric, fiber to inspection.

How Fabric Is Made: The Five Construction Families

Fabric is not one thing. It is built five different ways, from solution, from fiber, from yarn, as a composite, or as a multicomponent. What each family is and why structure drives cost and performance.

How Yarn Is Spun: From Fiber Bale to Bobbin

Fiber does not become fabric directly. It becomes yarn first. The seven industrial spinning steps, opening, carding, combing, drawing, roving, spinning, winding, and what each one does.

Textile Terms Every Designer Should Know

The core textile vocabulary, defined plainly: fiber, yarn, fabric, greige, dyeing, printing, finishing. The words your factory and your tech pack both rely on.

The Textile Value Chain: From Fiber to Finished Garment

How fiber becomes a garment across five value-adding stages, and the difference between a composite and a non-composite garment unit that decides who owns which steps.

Types of Textile Fibers: Natural vs Manufactured

Every fabric starts as a fiber. The full classification, natural (plant and animal) versus manufactured (synthetic and regenerated), with the seed, bast, and leaf sub-groups explained.

Merchandising

13 articles

Basis of Apparel Costing: Inputs and the Cost Sheet

What a merchandiser needs before costing a garment, the buyer, sample room, and production inputs, plus the preliminary cost-sheet build from material cost through CM, profit, FOB, CFR, and CIF.

Carton Consumption & Costing: Formulas and a Worked Example

How to calculate the cardboard area a shipping carton needs and what it costs, with the inch and cm formulas for SFT and SQM, ply-board rates, and a full 36,000-piece order worked example.

CM Calculation: Machine Cost vs Minute Cost

How to calculate CM (cut and make) for a garment, the average machine-cost method and the scientific cost-per-minute (SMV) method, both worked to the same $18/dozen result.

CM to Full Package: The Manufacturing Upgrade Ladder

How factories move up the value chain, CM, CMT, HPP, FPP, and then OEM, ODM, OBM, what each supplies and owns, and where responsibility and margin shift as they climb.

Cost Sheet for a Composite Knit

A worked composite knit cost sheet, costed from yarn up (knitting, dyeing, finishing) rather than finished fabric, through trims to CM, profit, FOB, CFR, and CIF, showing why in-house yarn-to-garment changes the numbers.

Cost Sheet for a Non-Composite Knit

A worked non-composite knit cost sheet, costed from finished fabric by weight (kg), through value-added work and trims to material cost, CM, profit, FOB, CFR, and CIF, with real per-dozen and per-piece figures.

Cost Sheet for a Woven Garment: A Worked Example

A full worked woven-garment cost sheet, fabric, value-added work, trims, then the summary from material cost through CM, profit, FOB, CFR, and CIF, with real per-dozen and per-piece figures.

Fashion vs Basic, Seasonal vs Staple: Planning for Product Change

Why some products change six times a year and others once. The two axes of product change, fashion/basic and seasonal/staple, and the four-sector map that tells you how often to replan a line.

Garment Sample Types Explained: From Proto to TOP

The garment samples every order goes through, from design proto and fit sample to PP and TOP, what each one is for, who approves it, and how to pass on the first try.

OEM vs ODM vs OBM: The Three Apparel Manufacturing Models

OEM, ODM, and OBM are the three ways a garment factory can do business. What each model owns, where the margin actually sits, and which one your brand is really buying from.

Poly Bag Consumption & Costing

How poly bag weight and cost are calculated from volume and density, poly film types (PE vs PP), thickness units (gauge, mil, micron), density values, and two working cost formulas.

The Apparel Merchandising Process: From Line Plan to Line Release

How a clothing line actually gets built, from line planning and creative design through line adoption, technical design, and release. The full merchandising pipeline in plain language.

What Is 3300 in the Poly Bag Formula?

The 3300 (÷3,300,000) constant in the quick poly bag cost formula, what it is, why it works, and why it only applies to LDPE. Derived step by step from gauge and LDPE density.

Cutting Room

30 articles

Auxiliary Cutting Devices: Notchers, Drills, Slashers

The devices that transfer marks and notches from marker to garment parts, knife/hot/ink notchers, cold/hot/hypodermic/thread drills, and the inside slasher, and when to use each.

Computerized Cutting: Blade, Laser, Water Jet, Plasma

The four automated cutting systems, blade, laser, water jet, and plasma, how numerically-controlled cutting works (bristle bed, vacuum hold-down), and where each method fits.

Cut Order Planning: From Customer Order to Cutting Orders

Cut order planning translates a customer order into cutting orders, coordinating marker making, spreading, and cutting to minimise cost. Its responsibilities, the 50+ variables, and how it feeds marker and lay planning.

Cut Piece Preparation for Sewing

The eight steps that ready cut parts for the sewing line, sorting, position marking, ply numbering, right-side indication, bundling, bundle ticketing, grouping, and recutting.

Cutting Calculation Formula: Q = L·G·C·D

The order-quantity formula Q = L·G·C·D for cutting-room planning, what each term means, the planning assumptions and rules (10% over-cut, cut before sew), and a worked example.

Cutting Plan Mathematics: Worked Examples

How to build a cut plan from ply limit, garments per marker, and a size/colour breakdown. The cuts-required formula plus three fully worked examples across sizes and colours.

Cutting Room Flow Chart: The Process at a Glance

The cutting-room flow chart, garment production's first stage, shown as a 10-step sequence from pattern/marker through spreading, cutting, numbering, and bundling to the sewing line.

Cutting Room Organogram: Who Reports to Whom

The typical reporting structure of an apparel cutting room, from cutting manager down through in-charge/supervisors to spreaders, cutters, numbering, bundling, and cutting QC.

Cutting Room Process: The 10 Steps from Pattern to Bundle

The full cutting-room workflow, pattern/marker, cut ratio, fabric receiving, relaxation, spreading, marker making, cutting, numbering, sorting, and bundling, explained step by step.

Dimension of a Marker: Width, Length, and Type

A marker's two dimensions (width and length), the difference between block/sectional and continuous markers, and how splice marks are planned to avoid waste and incomplete pieces.

Fabric Losses in Spreading: The Five Wastes Outside the Marker

Fabric lost outside the marker, end-of-ply, end-of-piece, edge, splicing, and remnant losses, with typical percentage ranges and how to control each one.

Fabric Put-Up: The Five Ways Fabric Arrives

How fabric is folded or rolled by the mill, flat/open/rolled, folded and rolled, tubular, book fold, velvet frame, and how each put-up decides the marker, spreading, and cutting method.

Fabric Spreading Construction: Lay Forms and Spreading Modes

How fabric plies are laid for cutting, straight, stepped, and spliced lays, plus the spreading modes (face-to-face vs one-way, nap-one-way vs up-and-down) and the quality trade-offs of each.

Fabric Spreading Equipment: Surfaces, Machines, and Controls

The four building blocks of spreading equipment, surfaces, machines, fabric control devices, and end treatment, including tracked, pin, vacuum, air-flotation, and conveyorized tables.

Garment Symmetry: Why It Halves (or Doubles) Cutting Cost

Symmetric vs asymmetric garments, what makes a garment each, and why symmetry halves (or doubles) the effort in patterns, markers, spreading, and cutting, plus the closed-marker exception.

Marker Efficiency: The Formula and What Drives It

Marker efficiency is the percentage of fabric actually used in garment parts. The formula, the four factors that drive it (fabric, pattern shape, grain, standards), and typical benchmarks.

Marker Mode: The Three Nap Modes

The three marker modes set by fabric nap and symmetry, N/E/W, N/O/W, and N/U/D, ranked by fabric efficiency and quality, and why corduroy needs consistent nap within each garment.

Methods of Fabric Spreading: Manual to Fully Automatic

The five ways fabric is spread for cutting, by hand, hand-and-hooking, manual traveling machine, motor-driven machine, and fully automatic, and where each fits by fabric type and volume.

Methods of Marker Planning: Manual vs Computerized

How markers are actually made, manual pattern layout and the old copy methods (carbon, spirit, diazo) versus computerized marker making and plotting, and why CAD won.

Operator-Controlled Cutting: Shears to Dies

Manual and operator-controlled cutting methods, hand shears, portable straight and round knives, and stationary band knives and die cutters, with what each is best (and worst) at.

Parts of a Portable Cutting Knife: Six Components

The six components shared by straight and round portable cutting knives, blade, base plate, power system, sharpening device, handle, and blade guard, and how each affects the cut.

Pattern & Cutting Terms: From Block to Graded Pattern

The pattern vocabulary every designer needs, basic block, style block, first pattern, production pattern, graded pattern, plus grain lines, grain-line arrows, and required pattern markings.

Preparation for Cutting: Securing the Marker to the Lay

The steps between spreading and cutting, parking the spreader, relaxing knit blocks, rechecking the marker, and the seven ways to fasten the marker to the lay so it can't shift during cutting.

Quality in Fabric Cutting: The Five Measures of a Good Cut

Cutting quality means every part matches its pattern with no fabric damage. The five measures, accuracy, perpendicular cut, clean edge, heat control, and marking accuracy, and how lay height affects them.

Quality in Fabric Spreading: Six Checks That Protect the Order

A high-quality spread decides the quality of cutting, sewing, and final fit. The six things spreaders control, shade sorting, ply direction, defect handling, tension, alignment, and static.

Quality in Marker Making: Accuracy, Completeness, Knife Path

What makes a marker high quality, accurate complete data and lines, no omitted pieces, and a planned knife path, plus why CAD markers beat hand-drawn ones and how a single missing piece causes recuts.

Requirements of a Good Spread

What a high-quality fabric spread must get right, shade sorting, defect handling, tension and slack, flatness, ply alignment and direction, static, and design matching, as a single checklist.

Requirements of Marker Planning: Three Constraints

Marker planning has no single solution, only the most efficient one within three constraints: the nature of the fabric, cutting quality, and production planning. Plus long vs short markers.

The Cutting Room: Where Production Starts and Margin Is Won

The cutting room is where garment production starts and where fabric (about 70% of cost) is controlled. Its three objectives and four reasons it makes or breaks a factory's profitability.

Types of Marker in Garment Cutting

The seven marker types used in apparel cutting, mixed, open, closed, closed-on-open, blocking and re-laying, single-section and section, and how symmetry, fabric put-up, and efficiency choose between them.

Production

9 articles

Anatomy of an Industrial Sewing Needle: The Nine Parts

"A sewing machine is only as good as its needle." The nine parts of an industrial sewing needle, butt, shank, shoulder, groove, blade, scarf, eye, point, tip, and why each affects performance.

How to Identify a Sewing Needle: System, Point, Size

The three parameters that identify any industrial sewing needle, system, point (set/ball/cut), and size (Nm and Singer), plus a thread-size to needle-size reference table.

Needle Systems by Sewing Machine and Stitch Class

A needle system defines a needle's dimensions to fit a machine and stitch class. What a needle system is, how the codes work (DBX1 = 16X231), and a reference table by stitch class 100–600.

Seam Performance and Problems

What makes a seam perform, elasticity, strength, and flexibility, and the six seam problems that wreck garments: distortion, skipped stitches, seam grin, thread breakage, slippage, and yarn severance.

Sewing Thread Consumption: Methods, Ratios, and Figures

How to work out thread per garment, by measuring, by consumption ratios, or by formula, plus a stitch-ratio table, a worked 401 example, and typical thread consumption for common garments.

Stitch Classes and Types: The Six Classes Explained

What a stitch is (intralooping, interlooping, interlacing), the properties that define stitch quality (size, tension, consistency), and the six stitch classes from 100 chain to 600 covering.

Thread Consumption Equations by Stitch Type

Calculate sewing thread consumption per inch of seam for every common stitch class, 101, 301, 401, overlock, coverstitch and more, with the variables, the formulas, and a worked example.

Types of Seams: The Six ASTM Seam Classes

A seam's three dimensions (length, width, depth) and the six ASTM seam classes, superimposed, lapped, bound, flat, edge finishing, and ornamental, with what each is used for.

WRAP Principles: The 12 Standards

WRAP (Worldwide Responsible Accredited Production) certifies that sewn goods are made lawfully, humanely, and ethically. The 12 principles, from law compliance and no forced/child labour to health, safety, and security.

Dyeing & Finishing

8 articles

Care Label Symbols: The Five Symbols and What They Commit You To

The care-label system every garment needs - the five symbols (wash, bleach, dry, iron, professional care), how ISO 3758 / GINETEX and the US differ, and why the label must match what the fabric can actually survive.

Colour Fastness Explained: The Grey Scale, the Tests, and What to Spec

What colour fastness is, how it is graded 1–5 on the grey scales, the main tests (wash, rubbing/crocking, light, perspiration, water) with their ISO 105 and AATCC methods, and the ratings to write into a tech pack.

Dye Classes by Fibre: Which Dye Belongs on Which Fabric

The main dye classes - reactive, disperse, acid, vat, direct, sulphur, cationic, pigment - the fibres each is used on, and their relative fastness, so you can tell whether a colour will hold on your fabric.

Fabric and Garment Finishes: The Treatments That Change Hand and Performance

The mechanical and chemical finishes that change how a fabric feels and performs - mercerising, brushing/peaching, calendering, sanforising, plus resin/easy-care, water-repellent, antimicrobial and softeners - and what each does.

From Lab Dip to Bulk: How Colour Gets Approved

How a colour is signed off in apparel - from a colour standard and lab dips to bulk approval - covering the grey light-box conditions, metamerism, visual vs instrumental (ΔE) assessment, and what to write in a tech pack.

Garment Washing: The Wash Types and What Each One Does

The main garment and denim wash types - rinse, enzyme, stone, bleach, acid, garment dye, and hand effects - what each does to hand, shade and fabric, and what to specify so a wash comes back the way you drew it.

Shade Variation: Why Dyed Fabric Never Matches Itself (and How to Control It)

The three shade variations that ruin a garment order - batch-to-batch, side-to-side (listing), and end-to-end - what causes each, and the controls (shade bands, cutting by shade, dye-lot discipline) that keep a run consistent.

Textile Printing Methods Compared: Screen, Pigment, Sublimation, Digital

The main ways a print gets onto fabric - rotary and flat screen, pigment vs reactive, sublimation, digital inkjet, discharge and burn-out - with the hand, colour count, run-length and cost trade-offs that decide which to spec.

Quality & Testing

6 articles

AQL Inspection Explained: Sampling, Levels, and Accept/Reject

What AQL means, how final random inspection samples a shipment instead of checking every piece, how to read the ISO 2859-1 tables to get a sample size and accept/reject numbers, and the common 2.5 / 4.0 limits for apparel.

Building a Garment Measurement Spec: Points of Measure, Tolerances and Grading

How a garment measurement spec works - points of measure (POM), how to measure them, tolerances (± allowances), and grading across a size run - so a factory and an inspector work to one agreed set of numbers.

Fabric Defect Identification and the Four-Point System

The common woven and knit fabric defects, how to spot them, and how the industry-standard four-point system scores a roll to decide accept or reject - with the points-per-defect table and the acceptance formula.

Physical Fabric Tests: GSM, Strength, Abrasion, Pilling and Skew

The physical fabric tests a brand should ask for before bulk - weight (GSM), tensile and tear strength, abrasion (Martindale), pilling, and spirality/skew - what each measures, its method, and what to write as a tolerance.

Shrinkage, Spirality and Skew: Test Them Before They Ruin the Fit

How dimensional change is measured and specified in apparel - residual shrinkage after wash (AATCC 135 / ISO 6330), knit spirality/torque, and woven skew/bow - with the tolerances to write so garments don't shrink or twist out of spec.

The Technical Audit: How to Judge a Factory Before You Place an Order

What a technical (capability) audit checks before you commit to a factory - machinery and capacity, the quality system, sampling and testing, and how it differs from a social/compliance audit - with a practical checklist.

Sustainability

1 articles

Sustainability Certifications Decoded: What Each One Actually Verifies

A plain map of the major fashion sustainability certifications - GOTS, OCS, GRS, RCS, BCI, bluesign, OEKO-TEX, LWG, RWS/RDS, FSC, WRAP, SMETA, ISO 14001 - grouped by what they verify, and the one question (chain of custody vs claim) that tells you whether a label means anything.

IE & Lean

11 articles

Industrial Engineering in Apparel: Role and Payoff

What an apparel industrial engineer actually does, from plant layout to payroll, the 12 activity areas, and the four benefits: work simplification, productivity, profit, and earnings.

Introduction to Industrial Engineering

What industrial engineering is, and the six pioneers who built it, Adam Smith (division of labour), Taylor (scientific management), the Gilbreths (motion study), Gantt (the chart), Emerson, and Ford (the assembly line).

Method Study: Finding the Best Way to Do the Job

Method study breaks an operation into elements of motion to find the most effective way to do it. Its eleven objectives, and why no operation can be studied in isolation.

Motion Analysis: The Principles of Motion Economy

Fewer, shorter motions cut the time and energy of an operation. The principles of motion economy via the MISS CHURN mnemonic, the body-movement hierarchy, and motion analysis's four objectives.

Obligations of an Apparel Engineer / Supervisor

A production supervisor's obligations split into primary (safety, line balancing, quality, people) and secondary (delegatable), plus the daily routine from morning line-balancing to end-of-day reporting.

Productivity in Apparel: Output ÷ Input

Productivity is output ÷ input, not the same as production. What raises it, its direct and indirect variables, the five internal factors, improvement techniques, and why it means prosperity.

Techniques of Apparel Production Engineering

The eight tools an apparel production engineer uses to lift productivity from men, materials, and methods, method analysis, time study, capacity study, follow-up, bundle diagnosis, incentives, drill training, and SQC.

Techniques of Industrial Engineering: The 11 Core Tools

The eleven core industrial-engineering techniques, method study, work measurement, motion economy, incentives, value analysis, PPC, inventory control, job evaluation, material handling, ergonomics, and systems analysis.

Time Study: Setting the Production Standard

How a time study sets a garment production standard (SAM/SMV), the 8-step procedure from selecting the garment to adding allowances, and the formula SAM = Basic Time + Allowance.

Work Measurement Techniques: The Six Methods

The six work-measurement techniques garment manufacturers use, time study, judgment, predetermined motion-time systems (GSD), standard data, operator reporting, and work sampling, and when each fits.

Work Study for Apparel Production

Work study is method study plus work measurement. How the two techniques relate, why work study pays, its eight-step procedure, and the human factors that make or break it on the floor.

Trims

6 articles

All About Zippers: Parts, Materials, Functions, Sizes

How a zipper works and how to spec one, the six parts (slider, elements, tape, chain, stops, pull), materials (nylon/coil, plastic, metal), close vs open-end functions, L/R slider, and zipper numbers.

Buttons & Buttonholes: Types, Materials, Sizing

How buttons and buttonholes work as a closure, holed vs shank buttons, materials, ligne sizing (1L = 0.635 mm), the four buttonhole types, and vertical/horizontal/diagonal placement.

Elastic in Apparel: Types and Application

Elastic expands and recovers to close and shape garments. The materials (rubber, spandex), the four types (elastomeric film, braided, woven, knit), and exposed vs enclosed application.

Garment Labels: Types, Materials, Application

The labels every garment carries, main/brand, care, size, manufacturer, batch, flag, and special, plus label materials, woven vs printed messaging, and the four application/fold methods.

Sewing Thread Quality: The 10 Requirements

What makes a sewing thread good, tensile strength, smooth surface, uniform diameter, elasticity, low shrinkage, chemical and abrasion resistance, colour fastness, low metamerism, and lubrication.

Sewing Thread: Fibers, Structures, Twist

How to choose a sewing thread, its two functions (aesthetics + performance), fiber options (cotton, polyester, nylon, rayon), yarn structures (spun, filament, core-spun, air-entangled), and the role of twist.

Commercial

12 articles

Air Freight Calculation: Gross vs Dimensional Weight

How air freight is charged on the higher of gross or dimensional (volumetric) weight, the V/Kg formula (÷6000 cm / ÷366.14 inch), and two worked examples showing which weight wins.

Back-to-Back L/C: Trading Without Working Capital

A back-to-back L/C is opened against the security of an export L/C to buy raw materials, letting an export factory work without working capital. How it works, and Bangladesh Bank's rules.

Documents Required for Garment Export

The shipping documents every garment export needs, commercial invoice, packing list, certificate of origin, inspection certificate, bill of lading, bill of exchange, and insurance certificate, and what each proves.

Incoterms 2020 Explained: All 11 Rules

Incoterms 2020, the 11 ICC trade terms, split into any-mode (EXW, FCA, CPT, CIP, DPU, DAP, DDP) and sea/waterway (FAS, FOB, CFR, CIF), ranked from least to most seller obligation.

Letter of Credit Checklist for Merchandisers

The 16 clauses a merchandiser must check when an L/C arrives, parties, confirmed/irrevocable, goods description, prices, amount, shipping terms and dates, partial shipment, documents, and expiry.

Letter of Credit Mechanism

How a documentary credit works, the parties (applicant, beneficiary, issuing, advising, confirming banks), key terms (ICC, UCP 600, SWIFT, LIBOR), and Nostro vs Vostro accounts.

Methods of Payment in International Trade

The five international payment methods, cash-in-advance, letter of credit, documentary collection, open account, and consignment, ranked on the risk spectrum from most seller-secure to most buyer-secure.

Sea Freight Calculation: CBM/CFT and Containers

How sea freight is calculated by volume (CBM/CFT), the container-size capacity table (20ft to 45ft HC), and a full 36,000-piece worked example landing at $3.00 freight per dozen.

SWIFT MT 700 Field Definitions for Letters of Credit

What the SWIFT MT 700 message is and the key field codes in a letter of credit, from :20 credit number and :31D expiry to :44C latest shipment, :45A goods, :46A documents, and :50/:59 applicant and beneficiary.

Types of Letter of Credit

The ten letter-of-credit types, import/export, revocable/irrevocable, confirmed/unconfirmed, sight/deferred, transferable/non-transferable, and back-to-back, and which ones an apparel exporter should want.

What Is a Proforma Invoice?

A proforma invoice is a seller's commitment-to-supply document, listing goods, quantity, price, payment, and shipment terms. What it contains, how the buyer uses it, and how it differs from a commercial invoice.

What the Commercial Department Does

The garment commercial department runs imports, exports, and trade finance. Its core responsibilities, L/C management, export/import documentation, compliance, banking, logistics, and bonded warehouse.

Reference

7 articles

Apparel Engineering Abbreviations

The industrial-engineering abbreviations behind garment time study and line balancing, decoded, production systems (PBS, UPS, MPS), time systems (SMV, SAM, GSD, MTM, TMU), and line metrics (WIP, TPT, UCL/LCL).

Apparel Merchandising Abbreviations

The merchandising abbreviations used in buyer sourcing and order management, decoded, sampling (SMS, PP, TOP), measurement points (POM, HPS, CB/CF), packages (FPP, HPP, CMT), and seasons (S/S, A/W).

Commercial & Shipping Abbreviations

The commercial and shipping abbreviations in garment export, decoded, payment (L/C, DP, DA), Incoterms (EXW, FOB, CFR, CIF, DDP), documents (BL, AWB, CO, CI), and container/port codes (FCL, LCL, POL, POD).

Garment Size Grading Rules

How apparel size grading actually works, why sizing standards define body measurements not finished-garment grades, the three evidence layers a spec sheet should respect, and the UK/JIS reference curves behind them.

Production & Quality Abbreviations

The abbreviations used across garment production, quality, and compliance, decoded, planning (PPM, PCD, COP), seams/stitches (SS, LS, SNLS), quality (AQL, TQM, SQC), and compliance bodies (WRAP, BSCI, ISO).

Textile Abbreviations Cheat Sheet

The common textile abbreviations used in fabric sourcing, decoded, blends (TC, PC, CVC), yarn systems (Ne, Nm, Tex), construction (EPI, PPI, GSM), and dye/finish codes (YD, PD, AOP, D65).

Trim & Accessories Abbreviations

The common trim and accessory abbreviations used on a bill of materials, decoded, zipper codes (CE, OE, AL, RS/LS), materials (PP, LDPE, HDPE), and units (YPD, Grs, GG, Dzn).