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Decision fieldFree downloadSeamly2DGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemoveOpen accessPattern Grader Hiring BriefGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitFind patterns & fitFind patterns & fit
AreaPatterns & fitPatterns & fitPatterns & fitPatterns & fit
Best forDigital pattern draftingSearching current and out-of-print sewing patternsAuditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidenceScoping and accepting freelance pattern-grading work
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 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 brief does not approve a base pattern, size system, grade rule, pattern, file, provider, contract, classification, fee, fit, sample plan, production use, or intellectual-property position, and it does not replace qualified pattern, fit, CAD, employment, tax, privacy, and legal review.
Practical access
ForBothMakersApparel brandsApparel brands
Location or jurisdictionGlobalGlobalGlobalGlobal
AccessFree downloadFree accountOpen accessOpen access
FormatSoftwareCommunityStitch AuthorityStitch Authority
Source typeOpen-source projectCommunity databaseStitch AuthorityStitch 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 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 source-reviewed brief cites current U.S. Department of Labor task and title evidence, ISO documented-information, size-designation, body-table, and garment-measurement sources, first-party CAD exchange guidance, and one professional discovery route; it requires controlled inputs, explicit authority, receiver-tested files, sewn evidence, and acceptance records.
Linked page reviewedJul 21, 2026Jul 21, 2026Jul 16, 2026Jul 16, 2026
Next review dueJan 17, 2027Jan 17, 2027Jul 16, 2027Jul 16, 2027
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