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Decision fieldOpen accessHook & Needle Diameter ReferenceGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessConstruction Classification & Callout Verification RecordGlobalRemoveFree + paidPattern TestersGlobalRemove
Decision fit
Primary jobLearn techniquesFind patterns & fitSource productionFind patterns & fit
AreaYarnPatterns & fitProductionPatterns & fit
Best forChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeSearching current and out-of-print sewing patternsUsing construction codes without treating classification as a machine setting, material assignment, supplier translation, or performance guaranteeCoordinating an independent sewing-pattern test
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.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 reproduce licensed code diagrams, verify a user's proposed code, authorize an ISO and ASTM crosswalk, select a construction, set stitch density or machine settings, prove supplier repeatability or performance, or replace the licensed standards and qualified construction, sewing, production, testing, safety, and quality review.The interface and plan description do not prove tester reach, completion, feedback quality, fit validity, export quality, uptime, support, or suitability for an established release process. Measurements and photos can be sensitive personal data. Run a non-critical pilot, review the current privacy and service terms, define consent and photo rights, test exports and deletion, and keep pattern approval and release responsibility with the designer.
Practical access
ForMakersMakersApparel brandsApparel brands
Location or jurisdictionGlobalGlobalGlobalGlobal
AccessOpen accessFree accountOpen accessFree + paid
FormatStitch AuthorityCommunityStitch AuthoritySoftware
Source typeStitch AuthorityCommunity databaseStitch AuthorityFirst-party platform
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.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 guide cites the current public scopes and statuses of ISO 4915:1991, ISO 4916:1991, and ASTM D6193-16(2025), plus current seam-failure and seam-tensile methods; it keeps classification, translation, complete process definition, physical verification, and performance evidence separate.Pattern Testers currently offers application intake, tester selection, feedback, photos, approvals, issue tracking, revisions, a reusable tester directory, and release deadlines. The public pricing page shows a limited free plan and paid Pro and Business tiers. Its June 2026 privacy policy lists names, email addresses, measurements, photos, feedback, application history, and assignments among the data processed.
Linked page reviewedJul 16, 2026Jul 21, 2026Jul 16, 2026Jul 21, 2026
Next review dueJul 16, 2027Jan 17, 2027Jul 16, 2027Jan 17, 2027
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