No. He's 15. He's worn a kilt to school before (we are Scottish, living in France), but that's not what you mean, is it? He might do it as a joke.
It's an absolutely fascinating discussion. The gender stereotypes are so, so strong and ingrained in this - why girls wear skirts and boys do not; why teenage girls want to be 'sexy' and boys aren't bothered - or if they do, it's expressed in a different way and not through what they wear; the messages that they are getting from society about how men and women 'should' dress and what clothes do or don't say about the person wearing them.
I remember being in awe of the girls that rolled their skirts up or wore skin tight lycra tubes to school in my day. They seemed very grown up compared to me, I was a right nerd, and had a mother who disapproved vehemently of anything she deemed 'common' which definitely included rolled up / mini skirts to school.
As I said, we live in France where there are pretty much no uniforms. DS's girl friends generally wear jeans, tops and hoodies. In summer I guess there are more crop tops and short summer dresses around. But very very few of the girls dress in a way that is overtly 'sexy'. They just wear their normal clothes. But it strikes me as a rather British thing - schoolgirls in uniform with incredibly short skirts, tight or stocking tops / knickers on show and big fat ties. It takes me aback every time we come back to Scotland for a visit.
There was a protest at DSs school at the start of the year, demanding the right to wear bra / crop tops to school. The debate here tends to take a different slant: 'modesty' in dress is strongly associated with religious beliefs, mostly Islamic and Jewish, and French state schools are utterly laïque (no religious attire allowed in schools, no religion at all in fact). So suggestions that girls should not wear bikini tops to school are quickly linked to religious pressure for women to dress 'modestly' and they are rejected strongly by many young women. There's also the 'right to be sexually harassed / anti-puritan' thing that came out during the # MeToo campaigns: France has an particular attitude to this that I haven't quite got my head around.
The schools take the line that students should dress 'appropriately' in 'casual / formal attire' but they try not to come to the point of measuring hem lengths.