: If the .rar file contains a single size pattern, you will need to "grade" it to create a full size run (XS–XL).
Open the archive to see what "base" refers to. In apparel development, this usually contains one of three things: : Specifications, measurements, and materials.
: Integrate custom zippers, branded buttons, or toggles. 3. Material Strategy
To develop a unique piece from a base pattern, focus on that don't change the fundamental fit but alter the aesthetic:
: Swap a crew neck for a V-neck or add a raglan sleeve.