Super-Straight:
Keira Knightley

Though you may sometimes feel flat as a board and envy the curves other girls have, narrow figures like yours and Keira's are a designer's dream! Having a straighter shape, you can wear just about anything clothes-wise. And when it comes to swimsuits, creating curves on your supposedly "boyish" shape is a cinch! If you're a one-piece kind of girl, go for one with cutouts to add imaginary curves to your hip area. But we say, show off your slim bod! Try this Roxy bikini from CCS Girls ($42.99 for top; $34.99 for bottoms, ccs.com): The bandeau top and center neck straps will give your top a boost, while the width-wise stripes and colorful pattern will give the illusion of curves.

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