What is it about London girls that makes their style so utterly enviable? Here Sienna Miller effortlessly pairs leather shorts with a plaid tweed jacket and peep-toe ankle boots for the coolest Downtown-meets-Uptown fall look. The polished jacket smacks of Chanel, the white tee is fresh and modern, and the opaque tights streamline the look and add warmth to boot. It's flawless, really, and it can all be yours with pieces topping out at $150 for the statement-making must-have jacket...