Actually, I'd be interested in seeing his response to a woman wearing a kilt. If he insists 'skirts' are women's clothes, then ask if the girls at that school are allowed to wear pants.

After all, if boys can't wear kilts because they're 'girl's clothes', then girls should not be allowed to wear 'boy's clothes', right?

(Aside to the VP: caving in now will save you a lot of grief.)