WHEN BAD CLOTHES HAPPEN TO GOOD PEOPLE : The Olsen twins - not sure which one

You know how it is. You have no notice of a possible opera trip. Five minutes to get an outfit together and what do you know! Nothing to wear. So a quick trip to powder our nose in the loo before heading out and you spot the perfect piece to DIY up your bland outfit, the bathmat.
No one will know right!!?!
Some safety pins and a bit of sticky back plastic and Bob's your uncle!