Sézane is a household name in France, but the Parisian brand is just starting to gain traction in the United States, thanks to social media. Its collections, worn by celebs like Vanessa Hudgens and Lily Collins, are making sustainable fashion look authentically French and undeniably chic. Jane Birkin in the '60s + the environment = good combo. If roaming around a European city with ice cream is your desired aesthetic, Sézane has got you covered.