the question would also be how his peers are dressing. this reminds me of a parent who was crying bitereh trerin to be that his son was talking to girls and I laughed my head off in his face. I told him he was a fool. He sent his kid to a school with girls (it wasnt co-ed, they were just in the same building) so what does he expect!
so how are the peers dressing? what activity was he involved in that he was wearing jeans?
just keep your senses up but dont freak out.