Anyone over the age of 12 is not permitted to arrive at Disney World in full costume. (It creates confusion in Disney’s immersive environment.) Kids can dress up, though, so pack the little princess and pirate gear. Disney bounding - wearing an outfit inspired by a Disney character - is acceptable and has become quite popular. However, if your outfit pushes the limits towards costume you may be asked to remove it, so be prepared with a change of clothes if you’re unsure.