Ready for your next big fashion game-changer? Enter: the slouchy mac. As worn by Leigh Lezark last weekend, the unstructured 90s throw-on is your new go-to outerwear shape for spring. Here's what makes it different. Lately the mac has been a very French fashion editor statement (popped collar, pushed-up sleeves, figure-hugging), but this time it's worn open, loose and midi-length. Need more inspiration? Do a Pinterest haul for pics of Julia Roberts in Pretty Woman

See how to rework your party pieces for daywear, like super blogger Vivien Nagy.