Much smaller scale but don't forget about https://freesewing.dev/ https://freesewing.dev/ , written in javascript. Instead of designing from scratch, they have

Much smaller scale but don't forget about https://freesewing.dev/ https://freesewing.dev/ , written in javascript. Instead of designing from scratch, they have parametric models where you give your measurements and get a pdf output. Really nice community too Not that many models but you can also design your own with more experience