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Decision fieldOpen accessControlled Tech Pack OrientationGlobalRemoveFree downloadSeamly2DGlobalRemoveOpen accessHook & Needle Diameter ReferenceGlobalRemoveOpen accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemove
Decision fit
Primary jobSource productionFind patterns & fitLearn techniquesFind patterns & fit
AreaProductionPatterns & fitYarnPatterns & fit
Best forUnderstanding what a tech pack must control before using a template or releasing workDigital pattern draftingChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeAuditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence
Know before usingAn 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.Patternmaking 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.The reference is not a dimensional measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, gauge result, or proof that a proposed tool will produce the required fabric.The record does not create a production grade, supply universal increments or breakpoints, validate a CAD file or fit population, reproduce licensed standards, or replace qualified anthropometric, pattern, technical-design, fit, quality, accessibility, safety, statistical, and user-research review.
Practical access
ForApparel brandsBothMakersApparel brands
Location or jurisdictionGlobalGlobalGlobalGlobal
AccessOpen accessFree downloadOpen accessOpen access
FormatStitch AuthoritySoftwareStitch AuthorityStitch Authority
Source typeStitch AuthorityOpen-source projectStitch AuthorityStitch Authority
Source and review
What the source establishesThe 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 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 lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows and follows the Council's warning that company letter and number labels vary; blank aliases remain blank instead of being inferred.The guide cites current ISO body-table, size-designation, and garment-measurement boundaries plus two peer-reviewed studies that tested the relationship between conventional grade rules, anthropometric evidence, and garment fit; it requires product-specific target deltas and validation instead of publishing universal increments.
Linked page reviewedJul 16, 2026Jul 21, 2026Jul 16, 2026Jul 16, 2026
Next review dueJul 16, 2027Jan 17, 2027Jul 16, 2027Jul 16, 2027
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