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Decision fieldFree downloadSeamly2DGlobalRemoveOpen accessControlled Tech Pack OrientationGlobalRemoveOpen accessApparel Measurement Tolerance Setting RecordGlobalRemove
Decision fit
Primary jobFind patterns & fitSource productionSource production
AreaPatterns & fitProductionProduction
Best forDigital pattern draftingUnderstanding what a tech pack must control before using a template or releasing workTurning an inherited or proposed garment tolerance into a controlled POM method, capability study, decision boundary, inspection rule, and change record
Know before usingPatternmaking knowledge, controlled measurement files, production conventions, and sewn fit testing are still required. The software does not validate body measurements, ease, balance, grading rules, fabric behavior, construction, or product fit. The project currently labels its user wiki manual as needing updates, so confirm current commands and file behavior against the installed release and active support channels.An orientation rather than a completed product record; it does not supply a universal format, licensed standard content, measurements, tolerances, construction settings, labels, approvals, compliance conclusion, or product-release authority.The record does not supply universal POM values, validate fit across a population, prove process capability, choose a statistical study or sampling plan, reproduce licensed standards, or replace qualified technical, fit, quality, statistical, safety, compliance, and legal review.
Practical access
ForBothApparel brandsApparel brands
Location or jurisdictionGlobalGlobalGlobal
AccessFree downloadOpen accessOpen access
FormatSoftwareStitch AuthorityStitch Authority
Source typeOpen-source projectStitch AuthorityStitch Authority
Source and review
What the source establishesThe maintained Seamly2D repository identifies the application as GPLv3+ open-source patternmaking software for Windows, macOS, and Linux. It reads multi-size measurement files for standardized sizes and individual measurement files for custom-fit work, publishes downloadable builds and releases, and links an active website and user forum.The guide cites current ISO sources for documented-information, garment-measurement, stitch, and seam boundaries plus current U.S. FTC textile and care-labeling guidance; it explicitly separates those authorities from product-specific technical and market decisions.The guide cites current ISO, AATCC, and NIST sources for body and garment measurement boundaries, textile conditioning, dimensional-change testing, repeatability and reproducibility, and AQL-indexed sampling, while requiring the live product owner to set rather than inherit numerical tolerances.
Linked page reviewedJul 21, 2026Jul 16, 2026Jul 15, 2026
Next review dueJan 17, 2027Jul 16, 2027Jul 15, 2027
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