NWT Lulus Black Halter Backless Jumpsuit, Size Medium Works best for A to C cup sizes - consider sizing up for fuller bust. The night is yours in the Lulus Something to Behold Black Jumpsuit! Sleek and stretchy crepe knit forms a fitted bodice with darting and a high apron neckline. Spaghetti straps frame a sexy open back, while pant legs fall below the fitted waistband with diagonal front pockets. Hidden back zipper. Shell: 94% Polyester, 6% Spandex. Lining: 100% Polyester. Waist Fitted - very fitted at natural waist. Hip Not Fitted - room for hips. Undergarments May be worn with an adhesive bra, petals, or no bra. Fabric Fabric has some stretch. Inseam Size M measures approximately 31.5". Front Rise Size M measures approximately 14.25".