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Decision fieldOpen accessCraft Yarn Council StandardsUnited States · North AmericaRemoveFree downloadSeamly2DGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemove
Decision fit
Primary jobCheck standardsFind patterns & fitFind patterns & fit
AreaStandardsPatterns & fitPatterns & fit
Best forResolving yarn and pattern terminologyDigital pattern draftingSearching current and out-of-print sewing patterns
Know before usingThese are voluntary industry guidelines, not law, a licensed test method, or proof that a yarn, hook, needle, pattern, size, or care instruction suits a project. Publishers, manufacturers, and regions may use different names, aliases, chart symbols, size tables, and weight systems. Confirm the actual pattern key, measured tool diameter, yarn label and specifications, body or garment measurements, gauge, care evidence, and destination-market requirements.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.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.
Practical access
ForBothBothMakers
Location or jurisdictionUnited States · North AmericaGlobalGlobal
AccessOpen accessFree downloadFree account
FormatReferenceSoftwareCommunity
Source typeIndustry organizationOpen-source projectCommunity database
Source and review
What the source establishesThe Craft Yarn Council's current gateway publishes its yarn-weight system, crochet and knitting chart symbols and abbreviations, project levels, body-size tables, hook and needle aliases, care symbols, designer guidance, downloadable symbols, and a guideline PDF. The Council says yarn companies, tool manufacturers, publishers, and consultants developed the guidance to improve consistency in labels and patterns and asks industry participants to adopt it.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.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.
Linked page reviewedJul 21, 2026Jul 21, 2026Jul 21, 2026
Next review dueOct 19, 2026Jan 17, 2027Jan 17, 2027
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