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Decision fieldOpen accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemoveOpen accessNMSU Pattern Alteration GuideUnited States · North AmericaRemoveOpen accessSeam Allowance ConverterGlobalRemove
Decision fit
Primary jobFind patterns & fitFind patterns & fitFind patterns & fit
AreaPatterns & fitPatterns & fitPatterns & fit
Best forAuditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidenceChecking a common flat-pattern alteration methodWorking between pattern systems
Know before usingThe 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 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.
Practical access
ForApparel brandsMakersBoth
Location or jurisdictionGlobalUnited States · North AmericaGlobal
AccessOpen accessOpen accessOpen access
FormatStitch AuthorityReferenceStitch Authority
Source typeStitch AuthorityGovernment guidanceStitch Authority
Source and review
What the source establishesThe 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.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.The linked tool or guide is maintained inside Stitch Authority and was checked against its current public interface.
Linked page reviewedJul 16, 2026Jul 21, 2026Jul 15, 2026
Next review dueJul 16, 2027Oct 19, 2026Jul 15, 2027
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