If not the most interesting, then certainly the most beautiful class to watch is Native Costume. Due to the amount of cantering, especially in a large class, things can get a bit reckless. A classes, where the horses finish by lining up side by side, with the Costume class mounts lining up head to tail.
Many times backing up in line can weigh heavily on a judges score.
Many horses will not back readily when standing head to tail. This class can get pretty rowdy as the only gaits called for are a moderate speed canter and the hand gallop. The walk is called briefly to give the judge time to tally his information. The headstall used in costume class varies. Almost any type is allowed as long as they do not use any tie downs or martingales.