Oh, the French-girl look. The je ne sais quoi quality is true, and the country's street style heroes always seem so effortlessly gorgeous. How can they make skinny jeans and a T-shirt look like the most stylish ensemble ever? We spoke with Fanny Moizant, the creator of Vestiaire Collective, to learn more about the salient distinctions between her countrywomen's and Americans' styles in an effort to unlock some of the style mysteries of France.