A few days ago, I made a post about Exam Dress. In the comments, a few people insinuated that dressing up is a good way to 'psyche out' their fellow exam takers. I'm not sure if this actually works, but if somebody does get 'psyched out' due to your sharp dress, I'm pretty sure you wouldn't have to worry about that person getting a better grade than you anyway.
My favorite comment was from a female law student, who said that she once wore "a little black cocktail dress and four-inch stillettos" to an exam, because "people will think you have your shit together". If some girl showed up to an exam wearing a little black coctail dress and four-inch stillettos, I wouldn't think she has her shit together. I would think she's a slut.