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Decision fieldFree accountThreadloop Sewing Pattern DatabaseGlobalRemoveFree downloadSeamly2DGlobalRemoveOpen accessNMSU Pattern Alteration GuideUnited States · North AmericaRemovePaidPatternLab LondonGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitFind patterns & fitFind patterns & fit
AreaPatterns & fitPatterns & fitPatterns & fitPatterns & fit
Best forSearching current and out-of-print sewing patternsDigital pattern draftingChecking a common flat-pattern alteration methodGenerating an editable custom-measurement block
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.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.A measurement-generated draft is a starting block, not independent evidence of body capture, comfort, mobility, balance, garment ease, or production fit. The result depends on measurement accuracy, supported ranges, formula assumptions, selected options, and output handling. Review the service's privacy terms before storing body data and sew a representative toile before design, grading, or production use.
Practical access
ForMakersBothMakersBoth
Location or jurisdictionGlobalGlobalUnited States · North AmericaGlobal
AccessFree accountFree downloadOpen accessPaid
FormatCommunitySoftwareReferenceSoftware
Source typeCommunity databaseOpen-source projectGovernment guidanceFirst-party platform
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 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.PatternLab London's current drafting page says a user creates a measurement profile, selects a basic block or sloper, adjusts fit, dart placement, length, seam allowance, and sleeve options, then downloads the generated result as tiled PDF, AI, or SVG. The live catalogue names bodice, dress, trouser, and stretch blocks and displays a price before purchase.
Linked page reviewedJul 21, 2026Jul 21, 2026Jul 21, 2026Jul 21, 2026
Next review dueJan 17, 2027Jan 17, 2027Oct 19, 2026Jan 17, 2027
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