Open the archive to see what "base" refers to. In apparel development, this usually contains one of three things: : Specifications, measurements, and materials.
To develop a unique piece from a base pattern, focus on that don't change the fundamental fit but alter the aesthetic: baseclothing - О‘ОЅП„О№ОіПЃО±П†О®.rar
: Swap a crew neck for a V-neck or add a raglan sleeve. Open the archive to see what "base" refers to