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Decision fieldFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveOpen accessHook & Needle Diameter ReferenceGlobalRemoveFree downloadSeamly2DGlobalRemoveOpen accessNMSU Pattern Alteration GuideUnited States · North AmericaRemove
Decision fit
Primary jobFind patterns & fitLearn techniquesFind patterns & fitFind patterns & fit
AreaPatterns & fitYarnPatterns & fitPatterns & fit
Best forSearching current and out-of-print sewing patternsChecking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gaugeDigital pattern draftingChecking a common flat-pattern alteration method
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 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.The guide's general womenswear diagrams and ease ranges are teaching examples, not an individual diagnosis, current commercial-pattern specification, or complete fitting course. A named symptom can have several causes, and alterations may affect adjoining seams, facings, collars, sleeves, balance, and style. Verify the method against the exact pattern and test the coordinated changes on a muslin.
Practical access
ForMakersMakersBothMakers
Location or jurisdictionGlobalGlobalGlobalUnited States · North America
AccessFree accountOpen accessFree downloadOpen access
FormatCommunityStitch AuthoritySoftwareReference
Source typeCommunity databaseStitch AuthorityOpen-source projectGovernment guidance
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 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.New Mexico State University's current Cooperative Extension Guide C-228 explains three alteration methods, folding out fullness, slashing and spreading or overlapping, and redrawing darts or seams. It provides illustrated bodice, sleeve, skirt, and trouser examples and tells readers to compare body measurements plus intended ease with the pattern while preserving grain, design lines, related-piece changes, and comfort ease.
Linked page reviewedJul 21, 2026Jul 16, 2026Jul 21, 2026Jul 21, 2026
Next review dueJan 17, 2027Jul 16, 2027Jan 17, 2027Oct 19, 2026
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