I'll take the controversial opinion haha.
Personally, I think it's a great idea and do wholly believe that we should have access to whichever uniform we want.
But, for example, there aren't actually any pants in my school's uniform (apart from sport tracksuit pants). We are an all-girls school.
So having access to pants in the uniform would actually come with the expense of designing and manufacturing the pants, not to mention the price on top of a uniform that already costs around $1000 outright.
Because of the huge unlikelihood the uniform would be altered and the huge likelihood those who chose to wear it would face social stigma, I don't think it's a good idea.
Thinking that I too would prefer pants over dresses, skirts and stockings, I thought about other ways to improve the uniform.
I'm not too fussed with a blouse and jumper, since that would be what is worn with pants. I think the blazer is pretty standard for all school uniforms, too. The skirts are definitely cold in winter - that's what I wholeheartedly agree with. I'm not sure about you, but we are allowed to wear woolen tights instead of stockings, which don't rip and are somewhat warmer. Some girls even wear skins other clothing beneath their tights for warmth.
Overall, I think the idea of pants at my school is so far-fetched I can't even imagine it.
If it suits the image of other schools, I think that is great. But unless everyone agrees and there is some significant push for it that would warrant the production of pants as a new uniform item, I don't think it's entirely necessary.