Hermione and Harry had tried to convince the oldest witch of the three women to go with something different, since her age group usually wore less edgy items, but the Transfiguration professor had insisted on wearing exactly that since it had worked perfectly well the last time she had had to mingle with muggles. Unsurprisingly, that had been twenty years ago, around the time that Grease had come out and caused a wave of leather jacket hysteria.