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Decision fieldOpen accessNMSU Pattern Alteration GuideUnited States · North AmericaRemoveOpen accessSeam Allowance ConverterGlobalRemoveFree accountThreadloop Sewing Pattern DatabaseGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitFind patterns & fit
AreaPatterns & fitPatterns & fitPatterns & fit
Best forChecking a common flat-pattern alteration methodWorking between pattern systemsSearching current and out-of-print sewing patterns
Know before usingThe 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 unit reference; the correct allowance depends on material, seam type, and production method.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.
Practical access
ForMakersBothMakers
Location or jurisdictionUnited States · North AmericaGlobalGlobal
AccessOpen accessOpen accessFree account
FormatReferenceStitch AuthorityCommunity
Source typeGovernment guidanceStitch AuthorityCommunity database
Source and review
What the source establishesNew 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.The linked tool or guide is maintained inside Stitch Authority and was checked against its current public interface.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.
Linked page reviewedJul 21, 2026Jul 15, 2026Jul 21, 2026
Next review dueOct 19, 2026Jul 15, 2027Jan 17, 2027
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