PorterEdit declares the slip dress as a wardrobe must-have because it's endlessly versatile and oh-so chic. Alexander Wang's midi version is cut from fluid silk-charmeuse and has chain shoulder straps and asymmetric lace trims along the triangle cups. It's designed for a slim fit and turns to reveal a flattering ruched back. Style yours with a T-shirt and sneakers during the day or barely-there sandals and a clutch for evening.