Before you target the French, note that some British schools (it was in the papers a month or two ago) have also banned such clothing, and to be honest I wouldn't be surprised if Americans have similar bans at some of their schools. It's actually done for a reason - if the clothing was to get damaged or catch on something while they were in (for example) a woodwork class then the school could get sued. I've literally seen such a case.
Having said that, I still think it's stupid to do a ban - I just think they should make it clear that the student is responsible for their own clothing and any problems that may arise because of their clothing regardless of what activities they partake in.
Buuuuut the world is too penickity about such things these days.
