I've heard those who grow up with them don't mind them so much. My eldest son never did. My younger struggles with pants, period. And by struggles with pants, I mean, he can't keep them up. Belt doesn't do it for him, either. Elastic works, but its hard to find in approved school pants. Not impossible, but difficult.
It sounds horrifying to me, probably because I didn't grow up with it. I wasn't accustomed to it. And I hated school anyways, so if there had been a uniform shift in my day, it probably would have been one more negative factor for school. (Despite having good grades, I had severe social anxiety, making functioning comfortably in a group atmosphere very difficult.)
I think for me, the creativity regarding clothing was a bit more than "but this is me, man! You can't suppress me!" I was/am fascinated with clothing. I would design clothes(I actually had a teacher who took a few of my pictures for her seamstress), was fascinated with costumes, and drawing designs with my make up. My high school art teacher tried to convince me to devote a semester to putting together outfits and photographing them(but I unwisely declined; I wanted to learn to paint, which I ended up hating). Working within the limits of a uniform would have been.... like the food prep class being confined to a microwave(I hear it is now.
)