This bust took us a couple of tries to get right! We ended up unpicking it and pinning it on her body so that we knew the exact fit we wanted. Both pieces of the bodice have a fair bit of bias stretch What is this bustline called? Vintage Fashion Guild Forums So I chose this dress because it sticks out. Her bust line is really shown in this dress which helps because this specific character represents Sarah's sexuality and how awkward it is. Under bust cut style line* is a design detail where the seam or cut of a garment runs directly beneath the bust area. It's often used in dresses, tops, and gowns to: * Ida Sandor Size Chart How to Measure Your Bust for a Dress: A Step by Step Guide