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Decision fieldFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemoveOpen accessYarn Substitution PlannerGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitChoose materials
AreaPatterns & fitPatterns & fitYarn
Best forSearching current and out-of-print sewing patternsAuditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidenceTurning a known project length and candidate package size into a transparent buying estimate while keeping specimen, finished-fabric, care, and supply decisions separate
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.The record does not create a production grade, supply universal increments or breakpoints, validate a CAD file or fit population, reproduce licensed standards, or replace qualified anthropometric, pattern, technical-design, fit, quality, accessibility, safety, statistical, and user-research review.The tool does not verify label values, convert between metres and yards, identify fibre or yarn diameter, assign a yarn-weight category, predict gauge or fabric, prescribe reserve, guarantee required quantity, check dye-lot supply, score candidates, or approve a substitution. A representative treated specimen and project-specific fabric, care, wear, comfort, supply, and quantity review remain required.
Practical access
ForMakersApparel brandsMakers
Location or jurisdictionGlobalGlobalGlobal
AccessFree accountOpen accessOpen access
FormatCommunityStitch AuthorityStitch Authority
Source typeCommunity databaseStitch AuthorityStitch Authority
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.The guide cites current ISO body-table, size-designation, and garment-measurement boundaries plus two peer-reviewed studies that tested the relationship between conventional grade rules, anthropometric evidence, and garment fit; it requires product-specific target deltas and validation instead of publishing universal increments.The planner performs visible arithmetic only on user-entered project length, reserve, package length, package mass, and price. Its connected source-reviewed guide cites the current Craft Yarn Council category, FAQ, WPI, and hook-and-needle guidance plus ASTM and ISO linear-density sources, and explicitly separates label comparison from substitution approval.
Linked page reviewedJul 21, 2026Jul 16, 2026Jul 16, 2026
Next review dueJan 17, 2027Jul 16, 2027Jul 16, 2027
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