I hate "static" costumes, preferring a more dynamic "theatrical" approach (one of my degrees isn't in Theatre for nothing).
One time I dressed as a derelict in an old Army trench-coat, didn't shave for days, and dirtied my face. I slumped down outside in my host's doorway, clutching a wine bottle in a brown paper sack, then thumped the door.
"Oh, my God! Alex, come quick, there's a drunken wino outside!"
"Is he OK? Get him up."
"Oh, no! It's Tom!"
"Tom, you bastard!"
"Hi, Alex, here's some wine for your party!"
"Hey, everybody! Come see Tom's costume! He's a wino."
And when everyone had gathered, I ripped my trench-coat open and flashed them! Well, not a real flash, because I was wearing a Speedo, women being there. But otherwise naked under the trench-coat, except for cut-off pants legs held up by rubber bands at my knees.
That was some years ago when I was still in shape, and for the rest of the night women, and men, kept coming up to me and requesting: "Tom, will you flash me, please?" LOL!!!
Consider a theatrical approach for yourself. Will the venue allow for a runway presentation? How about starting with a layered costume, and then peeling off to reveal successive outfits underneath, until you reach a thong or something? Be as daring as you feel comfortable doing.
But the basic idea is "dynamic" rather than static. Don't just walk in and stand there. Add some drama, some story, some prepared lines. Pair-up with someone else, perhaps, and devise some business between you. He or she is the designer, you the (possibly incompetent) model. Have fun!