I think it just depends on what the evaluator(s) in your area find important.
When I'm evaluating a ref, I certainly don't give a rats patootie if they have a belt on or not. However, it is obvious from the comments in this thread that some evaluators do care about that.
Look at the guys in your vicinity who are in the position that you'd like to be at (as far as officiating success). If they are all wearing beltless pants, it may be an indication that there is some belief in your area that wearing beltless pants is part of the "accomplished official" uniform. If a lot of the top officials are wearing belts, it probably doesn't matter.
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