NWT Sz M Comfortable yet chic, the Mercer Midi Dress is a midi length tank dress with a built-in-bra perfect for showing off sun-kissed shoulders. The tonal, engineered print and long side slits create an effortlessly cool style. You've got the hook-up: built-in lingerie snaps make this dress bra-friendly. Fitted Midi Tank Dress With Interior Bra Shelf, Cups And Side Slits. 48" From Top Of Shoulder To Hem. Length: Midi. Rayon Spandex Jersey (96% Rayon, 4% Spandex). Hand Wash Cold, Separately.