Accidents happen. You didn’t mean to spill that entire cup of piping hot coffee on your lap. To save yourself from unnecessary anxiety on the day of your interview, have a back-up outfit in your car, properly enclosed and stored in a wardrobe or garment bag.
The wardrobe or garment bag will ensure that your outfit doesn’t get wrinkled. Hopefully, the day of your interview will be smooth sailing and you won’t need the back-up outfit, but it’s better to be prepared.