Need a little extra opacity for you bust piece on the Betty dress? This is literally the simplest and easiest way!, There are a handful of ways to line the bust piece of this dress, but I wanted to go 1950's Advance Princess Line Shirtwaist Dress Pattern Bust 42" No. Backroom Finds 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: * Vintage 1960s Women's Mod A line Dress Simplicity 8235 UNCUT (bust 34") Etsy Classic Tea Length Evening Stretch Satin Dress w Bustline Bow & Boned smcfashion.com 60s Simplicity 7126. 34 bust. empire waist bra dress babydoll A line shift. surplice wrap top + topper shell. 1960s Vintage Sewing Pattern