I saw those in use aboard a nuclear fast-attack that I rode for two or three days in 1970, that had just come back from the Barents and was ordered to AUTEC Andros (Tongue of the Ocean) for torpedo tests. The officers and enlisted all wore an ultramarine-blue one-piece coverall with iirc canvas shoes of the same color, with white-trimmed gum soles. Scary-smart guys, they got a Presidential Unit Citation on that cruise, and on another back to the Barents the next year. Great people.
When I went T.A.D. to Boat Crew {Liberty Launches} in ports where we anchored out we wore dark blue ones. They were highly functional. They could call it the Navy just say no to crack policy LOL.
I wear coveralls all the time now. I don't even own a pair of pants.