Royals have historically avoided black for anything but funerals, StyeList notes, and Princess Diana caused a fuss when she wore black for one of her first official appearances in 1981. But while some of the British press seem aghast at the color of Kate's outfit, including a coat by the now-sensational label Libelula, we applaud her choice. Black is pretty much always a great thing to wear, even at a white party. Besides, Kate wore purple shoes and carried a purple bag. We'd have suggested she get those items in black, ideally something that sparkles.