Parade of Nations? More like fashion show of the world's fittest. While their ancient counterparts wore little more than olive oil, this year's Olympic athletes will flex their muscles in the likes of Giorgio Armani, Stella McCartney, and Ralph Lauren. With all eyes on the XXX games in London, designers kick workout- and workwear into high gear. (Is there anything more boss than a Chanel tennis racket?) Whatever your main event, remember: It's not whether you win or lose, it's how you dress for the game.