larrygrylls But t shirts are worn by girls and boys totally happily. It is not ‘banning’ them to not make them a part of school uniform. The clue is in the word ‘uniform’.
When something was previously allowed as a uniform option and then removed, it is correct (if somewhat emotive I will admit) to say this option has been banned.
The school in question and every single school I am aware of here have skirts as part of the uniform. The school in question disallowed the wearing of skirts, ie they got banned.
You are right that something that has never been a uniform option such as t-shirts can't or at least shouldn't be said to have been banned.
As for the enforcement of rules. First of all, the same applies as to enforcing all other rules at school. There are a great number of options, methods and techniques available for that. If uniforms cause particular problems I would look for a problem with the policies around them and definitely not call the police on my pupils.
Whatever my personal preference is in regard to school uniforms, after 17 years of having kids at school myself and about 24 years of observing kids in various schools and following the debate around school uniforms closely, it seems evident that the best policies are grounded in an understanding of the economic restraints parents may face, a solid knowledge of child development, an awareness of teenage behaviour as well as motivations and the recognition of the at times complex power dynamics at schools.
The best uniform policies therefore set reasonable, clear and fair standards, violations are dealt with according to severity and cause, never ever treated as criminal behaviour and/or a threat to the school and they do not lose sight of the purpose of schools - to educate children and prepare them for their adult lives.
Which is why all of the schools I know for instance do not punish pupils for wearing uniform items in the wrong colour and do not punish pupils who come close to (but do not quite meet) the standard such as wearing black trainers rather than black shoes. They send home a gentle reminder or give demerits for deliberate offenders and a school-wide parent letter if standards slip a little too far across the school. And then they give it a rest. Not a one of these schools has suffered for it.
We've just about recovered from a head teacher who was a uniform fanatic. Discipline went to shit. The teacher body was frustrated and unhappy with the lack of leadership but parents got a monthly uniform letter (that none of us took any notice of after the first year). Unfortunately, our pupils got barred from local shops at lunchtime because they carried their bad behaviour with them, but hey, at least everyone knew what local school they were from thanks to a strictly enforced uniform policy.
We've thankfully got a proper tyrant now who has scared the kids straight, supports his staff but has a much more relaxed attitude towards the uniform. And the school is much better for it - as is evident from much improved results and a much, much happier atmosphere.