Accessories will make the dress. Do you have white powder? If you not, you can use baby powder, although it may make you sneeze.
Make your face as pale as you can. If white doesn't work with your skin tone, look for a make up at the dollar store, several shades lighter than your skin.
Add a bright red dark lipstick.
From the dress, remove any frills ruffles, frills. Any girly touches remove, to give it a clean vamp look.
Perhaps you can spray it with glitter. Not a lot...just give it some shine.
Also jewelry. See if you can find any bigger costume pieces.
Good luck. Teeth and makeup will cover most of it.