I only recently learned that the sagging pants phenomenon has it’s origins in the American penal system. Prisoners combined one size fits all pants with the “no belts” policy of prisons to come up with this little bit of gangster chic.
The resulting “sagging pants” look was later adopted by the rap/hip-hop community as a way to enhance street cred and, I suspect, as a means of “keeping it real, yo” …
Personally, when I see some young person walking around, struggling to keep his pants on I am not thinking “gangsta” … more like “idiot.”
I’m much more “old school” about my trousers and I obviously had MUCH better taste in pants when I was young.