I went to a school in London that didn’t have a uniform, OP and the grass isn’t greener.
Money - my Mum said it was a lot more expensive getting clothes for me than it was for my older sibling who had a uniform and shopping took sooooooo much longer for the ‘right’ things (that both me and my Mum liked and that would be acceptable at school)
Hideous - Oh you should have seen some of the hideous 90s fashion I wore (and there are school photos as lasting memory)
Comfortable - we still tried to get round the rules with questionable clothing (bare shoulders, showing midriffs, short skirts or shorts vs oversized coats that got in the way, hats etc)
Stupid Petty Rules - we still had these including hair styles and garish hair dyes etc., and there were more ‘diverse’ issues for he poor teachers to deal with as we got more and more creative.
Poor Kids - sorry OP but it is glaringly obvious who the poor kids are in no uniform as opposed to just a little bit, but in this way, your nose gets rubbed in it on a daily basis.
Time Spent Dealing With It - lessons were still disrupted by inappropriate clothing (ever remember those ‘Bodys’ that were like swimming costumes with poppers at your crotch? They would pop undone regularly, as just one example). We also still had a school PE kit that would come with the same issues.
Uniforms are so much more easier, although I do agree that some schools take it too far sometimes