I keep seeing back-to-school sales on jeans and denim advertised.
A) Never was I allowed to go to school in jeans; even in public school it was against the dress code. So even in college, when I could have worn anything, I wore regular casual pants, not jeans. I didn’t like to waste my two or three pairs of jeans on non-fun.
B) August and September are too hot for jeans. Most schools have A/C these days, but buses and the outdoors don’t.
C) Probably kids wear jeans to school nowadays because they’re not allowed to play after school. It’s all sports and shorts.