Kate Middleton is the queen (er, princess) of preppy styles. She recently debuted what may be her best outfit of the year, and I'm already scheming up ways to replicate it. During a romp through Rhs's Wellbeing Garden at Colchester Hospital, Middleton wore brown trousers with simple white sneakers, understated jewelry and a tan structured blazer, and the pièce de résistance of her ensemble was a Ralph Lauren striped button-down blouse that costs $790.