These stories always crop up after the summer holidays, when people have had a while away from school, and got a little bit too individual.
The same situation as always - child contarvevnes uniform policy - school enforces uniform policy - parent sides with child, conveniently swerving the issue away from uniform policy and into infringement (sorry!) or personal freedom.
I don't think that siding with your child against an institution they require for education is a good idea.
My life motto is, never upset someone whose co-operation you need.