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| Decision field | Open accessSeam Allowance ConverterGlobalRemove | Open accessYarnSubGlobalRemove | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove | Open accessNMSU Pattern Alteration GuideUnited States · North AmericaRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Find patterns & fit | Choose materials | Find patterns & fit | Find patterns & fit |
| Area | Patterns & fit | Yarn | Patterns & fit | Patterns & fit |
| Best for | Working between pattern systems | Replacing a discontinued or unavailable yarn | Searching current and out-of-print sewing patterns | Checking a common flat-pattern alteration method |
| Know before using | A unit reference; the correct allowance depends on material, seam type, and production method. | A suggested match is a data-based shortlist, not proof that the yarn suits the pattern or maker. Yarn records can be incomplete or wrong, prices and availability vary by market, and the site uses affiliate links. Confirm the required gauge, total length, fibre behavior, construction, care, color, dye lot, accessibility, and seller terms, then make and assess a representative swatch before committing. | 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 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 | ||||
| For | Both | Makers | Makers | Makers |
| Location or jurisdiction | Global | Global | Global | United States · North America |
| Access | Open access | Open access | Free account | Open access |
| Format | Stitch Authority | Reference | Community | Reference |
| Source type | Stitch Authority | First-party platform | Community database | Government guidance |
| Source and review | ||||
| What the source establishes | The linked tool or guide is maintained inside Stitch Authority and was checked against its current public interface. | YarnSub's official FAQ says its matching software compares gauge, texture, yarn weight and density, fibre content, and fibre qualities such as drape and softness. Discontinued yarns remain searchable as starting points but are excluded from suggested replacements, and each yarn page provides a route to report source-data problems. | 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. | 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 reviewed | Jul 15, 2026 | Jul 21, 2026 | Jul 21, 2026 | Jul 21, 2026 |
| Next review due | Jul 15, 2027 | Jan 17, 2027 | Jan 17, 2027 | Oct 19, 2026 |
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