One of the biggest reasons I've seen people use for a rotation is because they can carry different size guns with different types of attire. I call BS on this excuse. 300 days out of the year, I wear a T-Shirt and Cargo Shorts.
If you lived at 9000 feet you Would be changing your clothes, or eastcoast or even Alaska. Clothing can determine the holster and the gun to facilitate draw and clearing the action for a shot. Also the locale, going to a Broadway Play may present issues that may not be an issue in Phoenix.