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Decision fieldOpen accessHook & Needle Diameter ReferenceGlobalRemoveOpen accessSample Review & Approval RecordGlobalRemoveFree downloadSeamly2DGlobalRemove
Decision fit
Primary jobLearn techniquesSource productionFind patterns & fit
AreaYarnProductionPatterns & fit
Best forChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeApproving a named sample without accidentally approving bulkDigital pattern drafting
Know before usingThe 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 validate every size or user, prove bulk conformity, prescribe universal defect classes or AQL, replace testing or inspection, or establish compliance.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.
Practical access
ForMakersApparel brandsBoth
Location or jurisdictionGlobalGlobalGlobal
AccessOpen accessOpen accessFree download
FormatStitch AuthorityStitch AuthoritySoftware
Source typeStitch AuthorityStitch AuthorityOpen-source project
Source and review
What the source establishesThe 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 record applies version and lot controls from textile testing plus current ISO and ASQ acceptance-sampling boundaries to separate sample approval from bulk release.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.
Linked page reviewedJul 16, 2026Jul 15, 2026Jul 21, 2026
Next review dueJul 16, 2027Jul 15, 2027Jan 17, 2027
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