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As soon as I saw these Madewell Heathered Slouch Sweatpants ($50), I immediately had visions of Marant. True, the stripes are not colorful and shiny, but you still get the relaxed French gist. They would work with everything from a denim shirt to a tattered tee to a silky black tank. The best part is that they're sweatpants masked as chic pants. Comfort and style all in one package.