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Decision fieldFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessYarnSubGlobalRemoveOpen accessHook & Needle Diameter ReferenceGlobalRemoveFree downloadSeamly2DGlobalRemove
Decision fit
Primary jobFind patterns & fitChoose materialsLearn techniquesFind patterns & fit
AreaPatterns & fitYarnYarnPatterns & fit
Best forSearching current and out-of-print sewing patternsReplacing a discontinued or unavailable yarnChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeDigital pattern drafting
Know before usingCommunity 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.A suggested match is a data-based shortlist, not proof that the yarn suits the pattern or maker. Yarn records can be incomplete or wrong, prices and availability vary by market, and the site uses affiliate links. Confirm the required gauge, total length, fibre behavior, construction, care, color, dye lot, accessibility, and seller terms, then make and assess a representative swatch before committing.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.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
ForMakersMakersMakersBoth
Location or jurisdictionGlobalGlobalGlobalGlobal
AccessFree accountOpen accessOpen accessFree download
FormatCommunityReferenceStitch AuthoritySoftware
Source typeCommunity databaseFirst-party platformStitch AuthorityOpen-source project
Source and review
What the source establishesThreadloop'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.YarnSub's official FAQ says its matching software compares gauge, texture, yarn weight and density, fibre content, and fibre qualities such as drape and softness. Discontinued yarns remain searchable as starting points but are excluded from suggested replacements, and each yarn page provides a route to report source-data problems.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 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 21, 2026Jul 21, 2026Jul 16, 2026Jul 21, 2026
Next review dueJan 17, 2027Jan 17, 2027Jul 16, 2027Jan 17, 2027
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