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Decision fieldOpen accessHook & Needle Diameter ReferenceGlobalRemoveFree downloadSeamly2DGlobalRemoveOpen accessGarment POM Definition & Verification RecordGlobalRemove
Decision fit
Primary jobLearn techniquesFind patterns & fitSource production
AreaYarnPatterns & fitProduction
Best forChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeDigital pattern draftingTurning an ambiguous POM name, code, or diagram into a reproducible method before setting targets, tolerances, or inspection decisions
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.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 record does not reproduce licensed ISO measurement drawings, supply universal POM codes or targets, approve an internal method, prove measurement capability or product fit, or replace qualified technical-design, pattern, fit, quality, metrology, safety, and regulatory review.
Practical access
ForMakersBothApparel brands
Location or jurisdictionGlobalGlobalGlobal
AccessOpen accessFree downloadOpen access
FormatStitch AuthoritySoftwareStitch Authority
Source typeStitch AuthorityOpen-source projectStitch Authority
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 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 garment-measurement, body-measurement, and textile-conditioning standards plus NIST measurement-process guidance for repeatability and reproducibility; it requires organization-specific codes, added points, targets, and tolerances to remain explicitly controlled.
Linked page reviewedJul 16, 2026Jul 21, 2026Jul 16, 2026
Next review dueJul 16, 2027Jan 17, 2027Jul 16, 2027
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