I always love the thought of little black dress. But for this instance I choose a black coat which I can wear with anything! It's quite a very versatile outfit, I can wear this at school and even at a client meeting. It will remove the look that you're tired from school and will give the impression that you always want to stand out from the rest even at school. As what they say, the equation for a good style at school is "uniform + UPSCALE SPLURGE/S = Fabulous."