Try an edgy miss clause, snow man, reindeer outfit or better still an elf. It may actually look really cute. Remember to let your costume give a message on the true meaning of Christmas.
Try something new. Everyone wears the Santa Clause and Iceman costumes in different ways, but that is no surprise. Try to amaze everyone else. Be a protester like the Ferguson one or middle-east, even better, be a Santa-protester. Depends on your creativity.