Dress Size Guide Women's Dresses Size Chart Primark US Ruched Bust A Line Mini Dress in White What Is an A Line Dress? A Guide to This Flattering Style 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: * Did you know your dress form has its own anatomy? From the bust, waist, and hip lines to the center front and back, every marking is designed to guide you in creating