Accordions are always welcome. Look at some of the other threads in this subforum, and see what interests you. But no particular dress style is mandatory. Not sarongs, not tutus, not utilikilts, not bellydancing outfits, not crinolines, not loinclothes, not shirtcocking, not chainmail, cross-dressing. Go for comfort, and in your case because it matters to you, fun. Have something for hot days and something for cold nights. And have fun.
(Ratty has a thousand ideas on how to make costumes. You should look at her threads--much good stuff there.)
Simon's real sig line?
Embrace the Sock