Leather's long been an easy way to luxe up an outfit, but for Fall 2012, designers (like Alexander Wang, at left, and Givenchy) showed entire looks made from the material. Obviously, though, leather's better suited to cold-weather wear (c'mon, you've seen the Friends episode with Ross' leather pants). The trick to making it work in the late summer? Pick leather shorts—preferably perforated—and add a tee or tank that's only trimmed in the buttery material. Simple flat sandals and a sporty backpack will keep the look from heading into S&M territory.