An edgier version of the empire dress's just-below-the-bust waistline, the trapeze dress - also know as a tent, A-line, or sack - has no waistline at all.

The blousy trapeze dress works best with a short, sassy hemline and a deep scoopneck. For a flattering twist on the shapeless style, choose a fitted, banded neckline.

Popping up all over the '07 runways, the tent dress is particularly trendy at the moment. Because it has been around since the '60s, though, it will like be a staple shape for years to come.