Kate Middleton has a way of making even the simplest spring outfit feel instantly elevated . . . and her latest look is no exception! The Princess of Wales leaned into her signature formula of timeless staples paired with one standout piece, creating an outfit that feels polished without trying too hard. Naturally, it was her breezy pleated skirt that stole the show. On May 14 in Reggio Emilia, Middleton stepped out in a polished mix of wardrobe…