Extra points to Roger for continuing the folk process on this one.

Both "BVDs" and "dungarees" rhyme properly with "knees" -- which "jeans" does not -- so you're on the right track there.

Of course, real BVDs do not have knees (they're shorts, briefs or boxers, never long johns), so the "skid marks" lyric is an excellent way to work in the BVD reference.