Penelope Vintage 1950s Style Dolores Swing Circle Party Dress 97% cotton Top quality cotton satin You could measure your bust by this ways: Only wear a bra, pull tape across the fullest part of the bust, so you could get your bust size. For example, if your bust is about 34, so you could choose size US6 below US4: Bust- 32". US6: Bust- 34". US8: Bust- 36". US10: Bust- 38". US12: Bust- 40". US14: Bust- 42". US16: Bust- 44". US18: Bust- 46"