Pretty much all fashion, when viewed from the outside, appears objectively dumb. But sometimes, for whatever reason, something persists- be it the west spending a couple hundred years tying a useless piece of overpriced fabric around their neck for no apparent reason, or a couple decades of sagging pants.
And if you want to talk about preventing movement- well, I had a job interview today, so I had the pleasure of going across town in the height of summer in a wool suit, tottery pencil skirt that restricts my stride, shoes that are designed to be painful, and fake legs that go over my real legs because for some reason my real legs are “unprofessional” as is, but can be somehow rendered “professional” with an completely bizarre thing film that lasts about two wearing before it gets ruined. WTF is that about?
The other day, I got stuck behind one of these sagging-pants guys while riding up an escalator. So, not only am I three feet behind him, I’m also three feet below him. I was craning my neck to look in any direction but in front of me.
Are we complaining about neckties now? The worst is when restaurants/catering places require them for waitstaff. I am not an old man, I do not have a stock of tie pins, and this nasty, difficult to wash length of fabric is dragging in everybody’s soup.
The only thing that I find more stupid than sagging is baseball caps worn backwards or sideways.
Many baseball cap wearers seem a little unclear on the concept.
On the other hand, as soon as you are processed into any jail, they take your belt - presumably to prevent hanging yourself. Depending on your pants, sagging may be an inevitable consequence.
When I was a little younger and trimmer I easily got away without wearing a belt. The belt was mainly for looks. At work we had to change into field “uniforms” if we were out in the dirt playing around rather than dicking around with the computers and such. One technician, who liked to tease me and I enjoyed teasing him, asked one day “how can you get away without a belt out here”? He had quite the “beer gut” so I just replied “its easy when you don’t have something above pushing the pants down” 
Sideways baseball caps look cute, and I did not know that baseball caps facing a direction other that forward was actually something people still thought was remarkable. I think of that more like The Fonz wearing a leather jacket. Nowadays, leather jackets don’t make you coolly rebellious (if they ever did…I’m not like 70).