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| Decision field | Free accountSewportGlobalRemove | Open accessFabric Mass Unit ConverterGlobalRemove | Open accessApparel Grade-Rule & Size-Run Validation RecordGlobalRemove | Free accountThreadloop Sewing Pattern DatabaseGlobalRemove |
|---|---|---|---|---|
| Decision fit | ||||
| Primary job | Source production | Choose materials | Find patterns & fit | Find patterns & fit |
| Area | Production | Materials | Patterns & fit | Patterns & fit |
| Best for | Requesting apparel-production proposals | Translating the same fabric mass-per-area result between metric and U.S. customary listings | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence | Searching current and out-of-print sewing patterns |
| Know before using | A profile, proposal, match, or escrow status does not establish factory ownership, identity, capacity, workmanship, quality systems, labour or chemical compliance, delivery performance, contract enforceability, or project fit. Verify the legal and production entities, references, site and subcontracting, samples, compliance evidence, specifications, terms, and remedies directly. | 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. | 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. | 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 | Apparel brands | Both | Apparel brands | Makers |
| Location or jurisdiction | Global | Global | Global | Global |
| Access | Free account | Open access | Open access | Free account |
| Format | Marketplace | Stitch Authority | Stitch Authority | Community |
| Source type | Commercial marketplace | Stitch Authority | Stitch Authority | Community database |
| Source and review | ||||
| What the source establishes | Sewport's current brand workflow starts with an account and guided project enquiry, then exposes proposals from garment factories and production specialists. The platform tells brands to compare profiles, portfolios, location, price, and communication, then record service, delivery, payment, and contract terms in a formal proposal. Its service-provider workflow includes factories, sample studios, pattern cutters, tech-pack makers, sourcing specialists, and material suppliers, with optional split-payment escrow. | 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. | 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. | 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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