What the prototype lets you try
Choose dress designs, cut the fabric and sew garments for customers. The developer describes it as an early prototype with unfinished elements.
Prototype versus full release
Prototype 0.5.5 has downloadable archives on itch.io. The full release is sold separately on Steam, with a much larger collection of dress pieces, fabrics and accessories described in the launch announcement.

Prototype 0.5.5
An earlier standalone download for Windows, macOS and Linux, with an unfinished version of the design, cutting and sewing loop.
Full Steam release
A separate paid release with customer story commissions, a much larger item collection, Steam achievements and Steam Cloud. Steam lists Windows and macOS requirements.
Try the workflow before buying
Use the prototype to decide whether you enjoy planning, cutting and sewing. Check the Steam listing for the current full-game features, and keep saves from the two versions separate unless the developer confirms compatibility.
Open the official prototype