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Decision fieldFree downloadSeamly2DGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessSample Review & Approval RecordGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitSource production
AreaPatterns & fitPatterns & fitProduction
Best forDigital pattern draftingSearching current and out-of-print sewing patternsApproving a named sample without accidentally approving bulk
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.Community members add and quality-control the records, so confirm sizing, measurements, fabric suggestions, format, availability, errata, license, and purchase terms with the designer or publisher. Adding an entry to a stash does not provide the pattern files. Saved searches and private PDF storage are paid Plus features, and a listing or review does not establish pattern accuracy or fit.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.
Practical access
ForBothMakersApparel brands
Location or jurisdictionGlobalGlobalGlobal
AccessFree downloadFree accountOpen access
FormatSoftwareCommunityStitch Authority
Source typeOpen-source projectCommunity databaseStitch 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.Threadloop's official guide describes an independent, fully crowdsourced database covering available and out-of-print sewing patterns. Its search supports pattern type, fabric type, age group, body type, cup size, level, format, file features, language, measurements, availability, and other filters; members can also track a stash, wishlist, projects, reviews, and discussions.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.
Linked page reviewedJul 21, 2026Jul 21, 2026Jul 15, 2026
Next review dueJan 17, 2027Jan 17, 2027Jul 15, 2027
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