For their October StyleMint collection, Mary-Kate Olsen and Ashley Olsen have chosen another guest stylist. Last month, it was New York Times fashion editor Sarah Moonves. This month, it's Brad Goreski. The natty Californian is best known to pop culture participants as Rachel Zoe's former Bravo TV sidekick, but now he's on his own and working with two of the most watched faces in style. How'd he do with their t-shirts? Check out his video and let us know.