Where would you be without a staple white shirt in your wardrobe? Or a sheer, floaty, oversized version? Answer: in hell most mornings, deciding what to wear. Well, now there's a new shirt style to add to your can't-live-without repertoire: it's short sleeved, buttoned up and a little bit boyish. Pay particular attention to checks (consider this an update on your Kurt Cobain style flannel shirt), wide sleeves and sloped shoulders.