Seamly2D

Seamly2D is a free, open‑source application for creating garment patterns digitally. It provides tools for drafting basic slopers and generating complete patterns that can be adjusted to specific body measurements, with automatic calculations to ensure accuracy. The software supports updating existing designs to incorporate seasonal trends while maintaining consistent fit across sizes, including plus‑size options.

The program is aimed at fashion designers, brands, and researchers who need a reliable CAD solution for apparel development. By allowing a single pattern to be scaled to multiple sizes, it helps reduce material waste and the cost associated with producing multiple prototypes. Its cross‑platform availability for Windows, Linux, and macOS makes it accessible to a broad user base.

Seamly2D emphasizes sustainability and inclusivity in fashion, offering features that streamline the design workflow and enable precise tailoring based on 3D body scans or manual measurements. It is maintained as a stable, community‑driven project with ongoing contributions such as translations and feature enhancements.