Check it: there's a fine line between looking casual and casual cool. If it weren't for Kate Bosworth's denim vest by Current & Elliot, her gray tee would fall flat; pairing it with this essential piece pulls everything together in a snap. Pretty cool, huh? I like to wear my denim vests with frocks and billowy tops for a sweet, Bohemian vibe, but if that's not your thing, try it with a tank or simple tee, a la Bossie. However you do it, I guarantee hotness.