I wish we had school uniforms here. I grew up with it so it is very normal to me. Here the kids trail into school wearing whatever they please. We do have a dress code, but frankly most of the kids look like they just got out of bed, like they didn't even get changed even.
Putting on a uniform, tying your tie, cleaning your shoes all help with a sense of belonging, community. We also had houses, like in Harry Potter, and finding out your house was a big deal. Earning points to help your house be the best was a great feeling, losing points due to bad behaviour or poor work was a terrible thing and made people strive to work hard.
Making school a bit more about the community and less about I would be a good thing. JMHO of course.
We had a school uniform of white shirt, tie (that denoted your house), knee length navy blue skirt, blazer, regulation underpants, school sweater. In the summer we had a summer dress, blue gingham for the lower years and a nice paisley for the older years. There was a hat that was phased out the year I went there too. We even had school phys ed clothes, the shorts had piping the colour of your house. This was a regular, non fee paying, high school