Other than a RebYidd23 costume, there are some last minute options that can be easy. You can dress up as a painter by wearing paint stained clothes and carrying a paintbrush.
Wear anything! Frogette (and most women) complain they ‘have nothing to wear’. So any clothing should serve as a costume, since it’s not normally worn…
Try dressing up as an original (as in opposite of modern) Rebetzin. Ask your local Orthodox Rebetzin for guidance and maybe she can lend you appropriate head gear. No sewing/gluing required for this one. You can try a used clothing shop for the outfit.