Pro: It's getting warmer. Con: It's impossible to dress for the changing weather. A lightweight tweed jacket, halfway between a thin coat and a heavy cardigan, solves the crisis. Made famous by Coco Chanel, the boxy piece can make jeans and a T-shirt look ladylike or top off a pencil skirt and blouse. Try Sandro's navy version for a summer-to-fall jacket, or Wilfred's light gray bouclé to look polished and professional. If a neutral hue seems too stuffy, ASOS and MSGM went sporty with graphic neon brights. Click through the slideshow for sixteen options, guaranteed to instantly make you look like you put way more effort into your outfit than you actually did.