Jeans. Occasionally, we (myself and those of my acquaintance) call them by brand name (Levis, Wranglers, etc.) but usually only when referring to Western-style jeans, since no self-respecting kicker would be caught dead in "fashion jeans" made of flimsy material. I've never actually heard "denims" although I've seen it in print, and I've only ever heard grandparents use "dungarees".

Overalls are jeans with a bib and straps.

Coveralls are the things auto mechanics wear that cover . . . well, all. They zip up the front and have sleeves. (I've occasionally heard overalls called "coveralls" but that's never what I think of when I hear the term.)

Yeah, coulottes are the knee-length split skirts. My brother wore jammers in the Eighties, which were basically Bermudas in garish prints.

I once had pedal-pushers, too (in the Eighties). Mine were straighter-legged than the capris that are in now but they were pretty much the same thing.