Shorts are one of the more difficult pieces to pull off, especially when the forecast gets too chilly for bare legs. Just when we thought we had to store them until next spring, Sienna Miller served up the coolest ensemble that’s making us reconsider. During an outing in New York City, the blonde beauty chose to dress up a casual white tee with an elegant tweed jacket and edgy leather shorts, which she made appropriate for cold weather by layering over black tights. This simple styling trick lends added staying power to the abbreviated silhouette, and looks chic paired with peep-toe ankle boots