I wear Key bib overalls in the winter, both grandpas wore them, I like the fit. They are a bit warm for summertime wear what with the bib of denim over your stomach.
This year I started wearing what I always called painter's pants, in blue denim. Carhart's version is lighter than jeans, and has an extra pocket on the left leg that holds my cell phone. Key calls this style a dungaree.
Walmart carries this style of pant in the Dickies brand in a lightweight canvas, cheaper than the Carharts; but the first pair I bought had quality issues, the seam on one of the front pockets was missing for about an inch.
Robert