Ours is at umbc so heat shouldn’t be an issue.
I’m not a fan of shirts and ties without a jacket but I think that’s what most kids do (no shirt sleeve shirts please).

Some boys wear shorts and everyone wears sneakers, even the girls at our school.

Do you realize how hot and sweaty he'll get in a shirt and tie with a gown over that? Your son is right. Let him wear what he wants.

I want my son to wear a shirt, tie, and dress slacks. He wants to wear a polo and tennis shoes and says that's what all his friends are wearing. Just trying to gauge what might be common.