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| Decision field | Free downloadSeamly2DGlobalRemove | Open accessPattern Grading & Size-Run Validation RecordGlobalRemove | Open accessGOTS Certified SuppliersGlobalRemove |
|---|---|---|---|
| Decision fit | |||
| Primary job | Find patterns & fit | Find patterns & fit | Check standards |
| Also useful for | No additional job recorded | No additional job recorded | No additional job recorded |
| Area | Patterns & fit | Patterns & fit | Materials |
| Best for | Digital pattern drafting | Auditing inherited grade rules or controlling a new multi-size pattern release from approved targets through sample evidence | Checking GOTS certification records |
| Know before using | Patternmaking knowledge, controlled measurement files, production conventions, and sewn fit testing are still required. The software does not validate body measurements, ease, balance, grading rules, fabric behavior, construction, or product fit. The project currently labels its user wiki manual as needing updates, so confirm current commands and file behavior against the installed release and active support channels. | 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. | A company result is not a blanket approval; confirm the certificate scope, validity, facility, process, product, and transaction documentation for the exact purchase. |
| Practical access | |||
| For | Both | Apparel brands | Apparel brands |
| Location or jurisdiction | Global | Global | Global |
| Access | Free download | Open access | Open access |
| Format | Software | Stitch Authority | Directory |
| Source type | Open-source project | Stitch Authority | Official registry |
| Source and review | |||
| What the source establishes | The maintained Seamly2D repository identifies the application as GPLv3+ open-source patternmaking software for Windows, macOS, and Linux. It reads multi-size measurement files for standardized sizes and individual measurement files for custom-fit work, publishes downloadable builds and releases, and links an active website and user forum. | 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 official GOTS search exposes certified entities by country, field of operation, product category, and certification detail, including processing and trading scopes. |
| Linked page reviewed | Jul 21, 2026 | Jul 27, 2026 | Jul 15, 2026 |
| Next review due | Jan 17, 2027 | Jul 27, 2027 | Oct 13, 2026 |
| Inspect | |||
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