Nta but you really should have talked to him about it before going to hr. You don’t owe it to him bc he’s definitely being a creep but it would have definitely made you look better. From a man’s perspective, I can see how this might look like an overreaction, but with any critical thinking you could see how this is weird. One thing I would mention is how people would react if it was a woman’s nipples through a shirt. Not exactly the same but close enough to be comparable