Any girl with a Pinterest account knows that overalls have been having a moment. But you gotta get friendly with the new disco shape we're totally digging. Where winter's style was baggy and boyfriend, this season's cut is fitted, flared and super sexy: perfecto for summer. If you want to risk it, you can go T-shirt free and keep your fingers crossed for warm temps, or a simple crop top is its layering BFF. Anyway, enough with the foreplay, let's see how Lily Aldridge, Chiara Ferragni and Kate Bosworth wear theirs…