Okay, I'll grant that fashions have done some weird stuff before, but I think there's a fundamental difference when it comes the sagging thing.

Tie-dyed bell-bottoms with jingle-bells on them may be outwardly weird, but when you get right down to it, the difference between them and a pair of Brooks Brothers trousers is strictly window dressing. They both perform the same basic function; they cover the parts of your body that society has decided you can't just walk around lettin' hang out.

But saggy jeans are intentionally designed to expose, not hide, those parts. As such, they no longer really serve the function of pants at all. They've ceded that function to the underwear over which they are worn. The jeans have taken on the function of being something to carry your Glock and cell phone in. Why not just do away with the jeans all together, wear the underwear to cover your ass and dick, and carry a big shapeless tote bag around to keep your Glock and cell phone in? It'd be more comfortable and you wouldn't have to stop every few steps to pull your pants up.