We love Peter Pan collars this season. We love the soft, demure school girl look that can still be sexy and professional. Think Michelle Williams and Carey Mulligan, ever graceful, stylish, but with a little bit of edge. While this look can be a bit youthful, pair it with a pencil skirt or sexy heels to give it a grown up look. Also, steer clear from barrettes and headbands... that may be overkill.