Our school banned skirts years ago. They were fed up of wasting teaching time by enforcing skirt length against current trends (if you remember the microskirt with the small split up the side and fishnets?) and the girls came under considerable peer pressure to wear short skirts, whether they wanted to or not and most of them resorted to wearing cycle shorts as well.
While they were at it they got rid of the shirts, that dangled out over the skirts and trousers of both boys and girls and the much abused ties.
They replaced it all with practical stretchy non iron stuff that you could cycle to school in, crawl on the floor in drama and move about with without restriction.
Chucking out time, they all looked far tidier 
Of course you do not get that stiff starched look, with white shirts and kilts and done up ties and tucked in shirts with fancy blazers that people seem to desire in an attempt to emulate private schools. That was only realistic if you pick out the right children for speech day or something.
This was all done before my DDs started the school and they have long since left, so it is nothing new. And nothing 'gender neutral' appeasing about it.