Summer might as well be called stretch mark season. Those areas we've been hiding all season are on full display with shorts and bikini bottoms. Unfortunately, you can't get rid of stretch marks once they've formed. But you can mask them with a good self-tanner. Our favorite is St. Tropez Self Tan Dark Bronzing Mousse ($44). Use this product to create the illusion of thinner thighs — think of it as body contouring. Apply an extra layer to the inner and outer thigh for a slimming effect.