Clean, starched jeans, and longsleeve shirt. Belt. Cowboy boots (usually not clean, b/c how do you keep boots clean at cattle show?). I always figured I was there to SHOW so I would try to look as professional as possible at all times.
In inclement weather situations I never allowed myself to wear anything else ( jacket in the cold, short sleeve in heat). Also, no cowboy hat. I dont wear them anyways. However, I've discussed with multiple judges that dislike them in the ring, its harder to see the exhibitor's face and it is something else to get in the way.
Ryan