Here is an example of a basic suit. It's simple yet classy. Do not forget the tie clip! A floppy tie is enough to bring your whole look down. Also, a fitted shirt is key. You don't want to look like you are swimming in your clothes.
Because you’re going to be dancing for most of your dress-up time, you’ll be pairing blazers and jeans a lot. For that, you’ll want more casual blazers. Also, the sweater pairing is sharp, though probably too warm for the dance floor.