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| Decision field | Open accessYarnSubGlobalRemove | Open accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemove | Open accessFabric Mass Unit ConverterGlobalRemove | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Choose materials | Find patterns & fit | Choose materials | Find patterns & fit |
| Area | Yarn | Patterns & fit | Materials | Patterns & fit |
| Best for | Replacing a discontinued or unavailable yarn | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence | Translating the same fabric mass-per-area result between metric and U.S. customary listings | Searching current and out-of-print sewing patterns |
| Know before using | 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. | The 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 result is a numerical unit conversion, not a new measurement or conformance decision; it does not establish sample or lot representativeness, significant digits, drape, warmth, opacity, thickness, stretch, strength, shrinkage, durability, sewability, end use, target, or tolerance. | 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 | ||||
| For | Makers | Apparel brands | Both | Makers |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Open access | Open access | Open access | Free account |
| Format | Reference | Stitch Authority | Stitch Authority | Community |
| Source type | First-party platform | Stitch Authority | Stitch Authority | Community database |
| Source and review | ||||
| What the source establishes | 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. | The 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. | The calculator uses the NIST SP 811 Appendix B.8 conversion from avoirdupois ounces per square yard to kilograms per square metre and links to a source-reviewed fabric mass record for method, sampling, conditioning, and product controls. | 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 reviewed | Jul 21, 2026 | Jul 16, 2026 | Jul 16, 2026 | Jul 21, 2026 |
| Next review due | Jan 17, 2027 | Jul 16, 2027 | Jul 16, 2027 | Jan 17, 2027 |
| Inspect | ||||
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