Forget about protractors, Trapper Keepers and loose-leaf paper: This fall's must-have back-to-school essential is the headband. Take a cue from TV's most stylish students (of course, I'm talking about the cast of Gossip Girl) and use your headband to solve real-life beauty dilemmas. Tame growing-out bangs, disguise bed-head, and dress up running-late-for-class 'dos with this fun hair accessory that costs close to nothing. Class dismissed.