Originally Posted by Sarcasm-hime
You could get some romantic music or wedding music, walk on elegantly (maybe with a veil over your face and then dramatically lift it to reveal the costume?), make a few poses to show off the costume from different angles (walk in a small circle when turning in a long dress), then leave the way you came.
Given some conventions have pre-selected "runway" music for their walk on sections (our show uses this practice) I wouldn't rely to heavily on custome music. But the poses sound awesome. This particular costume is a good attention grabber from the get go, so you really should have no trouble gathering the eyes with it. The poses will definately enhance your hold on the audience.