I'm actually a little disappointed that he returned after a dress code change, because the way I see it, the problem was never the dress code itself, but how it was enforced. The rules say that you can be removed from the tournament in cases of gross misconduct. But there was nothing even close to gross misconduct here. Banning him from playing was just the arbiter power tripping.
People keep saying that the arbiter was just enforcing the rules. Yes, he was enforcing the rules, but he wasn't "just" enforcing the rules. He was using one of the heaviest sanctions for the most minor infraction.
The rules do say that a player will be removed for multiple infractions and the multiple infractions seem to come from the multiple rounds he would've played with his pants on. So the arbiter was "just" enforcing the rules.
People keep saying that the arbiter was just enforcing the rules. Yes, he was enforcing the rules, but he wasn't "just" enforcing the rules. He was using one of the heaviest sanctions for the most minor infraction.