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| Decision field | Open accessHook & Needle Diameter ReferenceGlobalRemove | PaidBootstrapFashion SlopersGlobalRemove | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove | Open accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Learn techniques | Find patterns & fit | Find patterns & fit | Find patterns & fit |
| Area | Yarn | Patterns & fit | Patterns & fit | Patterns & fit |
| Best for | Checking which U.S. alias the current Craft Yarn Council table gives a known metric package size before confirming project gauge | Buying a quick measurement-generated sloper | Searching current and out-of-print sewing patterns | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence |
| Know before using | The reference is not a dimensional measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, gauge result, or proof that a proposed tool will produce the required fabric. | Each purchase is an automated draft based on submitted measurements and the chosen product's formula, ease, fabric, and format assumptions. Supported input ranges do not prove fit, and product pages themselves recommend a muslin and additional adjustments for some figures. Confirm included instructions and file compatibility, protect stored body data, and test the output before design or production use. | 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 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. |
| Practical access | ||||
| For | Makers | Both | Makers | Apparel brands |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Open access | Paid | Free account | Open access |
| Format | Stitch Authority | Marketplace | Community | Stitch Authority |
| Source type | Stitch Authority | Commercial marketplace | Community database | Stitch Authority |
| Source and review | ||||
| What the source establishes | The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows and follows the Council's warning that company letter and number labels vary; blank aliases remain blank instead of being inferred. | BootstrapFashion's current sloper catalogue sells measurement-generated woven and knit blocks. Individual product pages accept body measurements and optional fit adjustments, state supported measurement and height ranges, disclose ease and fabric assumptions, and offer output choices including print-ready PDF and CAD-oriented PLT or DXF, with the generated file sent after purchase. | 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. | 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. |
| Linked page reviewed | Jul 16, 2026 | Jul 21, 2026 | Jul 21, 2026 | Jul 16, 2026 |
| Next review due | Jul 16, 2027 | Jan 17, 2027 | Jan 17, 2027 | Jul 16, 2027 |
| Inspect | ||||
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