The place I am staying for my old Program's annual conference this week has a "Dress Code and Policies" tab on its website. It has been almost a year now since I've had to worried about whether I'm sufficiently well-dressed to be somewhere.*
*The south, among its many other virtues, accepts a significantly more laid back approach to appearance. If I were to show up to most any academic event in a suit, the odds are good that I'd be the only one. I am aware that there are restaurants in Princeton where they'd look askance if I wasn't wearing a tie; the nicest restaurants in Durham (probably nicer than those in Princeton, FWIW) would look askance at you if you were.