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On the next episode of Gossip Girl, Blair (Leighton Meester) and Serena (Blake Lively) must pack their trunks full of Parisian fashion and head back to the Big Apple to get ready for Columbia. The two face obstacles upon their return—Blair (in Valentino) has issues getting into the campus’s ultra-exclusive club and Serena (in Jenny Packham) must deal with Nate and his new Girl Friday (Juliet). Tune in to the CW at 9 p.m. EST Monday night to watch the sure-to-be juicy episode, and click through the photo gallery for head-to-toe credits of what the gals (and guys) will be wearing!