Bummer! We'll always give you as much fit info as possible on the dress so this doesn't happen, however if it does let us know right away and we'll do our best to get another size or replacement dress out to you in time. If this isn't possible you may choose between store credit or a refund for the rental, as long as it is posted back to us unworn within 24 hours. Please note that we cannot refund shipping / courier fees.