What do you call those blue trousers?

In the dialect of my section of the (still too damn cold) Midwest, they are universally recognized as Blue Jeans.

John in Kansas wouldn't find those tell-tale rivet marks in our vintage school furniture, however, because blue jeans (along with farmer bibs) were specifically banned by the dress code, as were any clothing items with studs or other fasteners which could mar furniture, including blue jean and leather motorcycle jackets. This ban was rigidly enforced in both the public and parochial schools in our city, at least through the late 1960's and early 70's.

And Capri pants. Oh man, I remember my mother being scandalized by the fact that Mary Tyler Moore of the old Dick Van Dyke Show was allowed to wear such tight, form-fitting clothing on national television. It was, in Mom's eyes, too casual and too suggestive. Needless to say, these days Mom isn't a big fan of MTV.