I've noticed this super skin tight pants thing, often combined with rolling the longer length bottom up about five inches.
There's nothing wrong with wearing pants that fit, but I have to admit it looks odd on these types. Maybe society's still self-correcting from the super-baggy extreme of the '90s.
It's not just christian metalcore - every hispanic kid who wants to look emo, is wearing his sister's black jeans here in la. I'm seriuos! (wearing a ramones t-shirt gets you extra points).