Calling all fashion fanatics! Prom After Party Advice?

Hi, my prom is in a couple of months & I've got my outfit for it sorted and everything. After the prom though one of my friends is hosting an after party for everyone to go to and people are buying new dresses to wear. I have long brown hair to the middle of my back & likewise I have brown eyes. I'm quite pale skinned, do you have any ideas of kinds of things I could look out for buying? Outfit wise, I have no idea! Thanks x