I always get a black dress, something to show off the legs but obviously not too overdone. and if you do find yourself over dressed, just bring a matching cardigan sweater or something to cover. have fun. yea I'd just look really hot to make my ex boyfriend feel bad but whatever. have fun, that's the main thing
Wear good clothes and do a nice hairstyle, show ur ex what he has lost, wear something but not to show offy.
if you feel comfey with heels then you can wear a jeans or leggings with heels and a nice fluffy shirt, open some buttons not in a sluty way...a cute way...or if noone is wearing heels..if its winter you can wear boots...and if its summer...cute shorts with a cute fluffy shirt!