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| Decision field | Open accessKnitting Needle to Crochet Hook Size ChartGlobalRemove | Open accessEU VIES VAT Number ValidationEuropean UnionRemove | Free + paidPattern TestersGlobalRemove | Open accessPattern Grading & Size-Run Validation RecordGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Learn techniques | Check standards | Find patterns & fit | Find patterns & fit |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Yarn | Standards | Patterns & fit | Patterns & fit |
| Best for | Finding the current CYC hook and needle aliases that share one known nominal metric diameter before confirming project gauge | Checking an EU supplier's stated VAT number and saving the dated validation response as one identity and invoicing control | Coordinating an independent sewing-pattern test | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence |
| Know before using | A shared nominal diameter does not make a knitting needle and crochet hook interchangeable or predict equal gauge or fabric. The reference is not a physical measurement, manufacturer inspection, UK or Canadian conversion, steel-hook chart, tool recommendation, yarn assignment, or project approval. | A valid VAT number is not proof of manufacturing capability, facility ownership, authorized bank instructions, product origin, tax advice, quality, capacity, certification, labor conditions, or delivery; names and addresses may not be returned for every country, and temporary database outages occur. | The interface and plan description do not prove tester reach, completion, feedback quality, fit validity, export quality, uptime, support, or suitability for an established release process. Measurements and photos can be sensitive personal data. Run a non-critical pilot, review the current privacy and service terms, define consent and photo rights, test exports and deletion, and keep pattern approval and release responsibility with the designer. | 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 | Apparel brands | Apparel brands | Apparel brands |
| Location or jurisdiction | Global | European Union | Global | Global |
| Access | Open access | Open access | Free + paid | Open access |
| Format | Stitch Authority | Reference | Software | Stitch Authority |
| Source type | Stitch Authority | Official registry | First-party platform | Stitch Authority |
| Source and review | ||||
| What the source establishes | Rechecked July 28, 2026. The lookup reproduces the current public Craft Yarn Council metric and U.S. alias rows, aligns hooks and needles only when their nominal millimetre value matches, and leaves missing rows or aliases unfilled. | VIES is the European Commission's online VAT Information Exchange System interface for querying national VAT databases to determine whether a submitted number is valid for intra-EU cross-border trade at the time of the request. | Pattern Testers currently offers application intake, tester selection, feedback, photos, approvals, issue tracking, revisions, a reusable tester directory, and release deadlines. The public pricing page shows a limited free plan and paid Pro and Business tiers. Its June 2026 privacy policy lists names, email addresses, measurements, photos, feedback, application history, and assignments among the data processed. | 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 28, 2026 | Jul 15, 2026 | Jul 21, 2026 | Jul 27, 2026 |
| Next review due | Jul 28, 2027 | Oct 13, 2026 | Jan 17, 2027 | Jul 27, 2027 |
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