Oh awesome! That's such a great idea: If you can't sing the part, you can still dress the part!
You know, it's funny, but I was just looking through one of my favorite books, The Catropolitan Opera by Susan Herbert. It's a book of very lovely paintings with cats dressed up in scenes from famous operas. It sounds incredibly silly, I know, but the paintings are actually very detailed and beautiful, and the text is quite witty. You might want to check it out; it includes an impressive Queen of the Night, if you fancy a giggle. :)