We've been given a lot of rules about fashion over the years, and the messages can be pretty mixed. That's why we're thankful for the ever-honest Stacy London who breaks it down for us once and for all in The Truth About Style ($23). Out today, the fashion bible from the New York Times-bestselling author and host of What Not to Wear is a transformational and empowering how-to. It's a dense read, packed with tips and tricks, so we pulled out the five credos that we think should be permanently added to your style rulebook.