-a pair of trousers that has an extra piece of cloth that covers the chest and is held in place by a strap over each shoulder.

These are called bib overalls, or just bibbies, where I come from. They are also available in heavy canvas, thanks to the Carhart company and are very usefull to those that work in very cold climates. I used to own a pair that had knitted wool cuffs on them, like a sock without the foot part.