These Genuine US Military Issue, Size Large, Mechanic's Cold Weather Insulated coveralls are meant to be worn over your clothing, these run LARGE.
Very well made of heavyweight OD material with soft shiny lining on inside that covers chest, shoulders, and arms.
Complete with heavy brass zipper, slit on both sides of hips so you can get keys, knife, etc. out of your pants without taking coveralls off.
Coverall also has 1 large pocket with zipper and elastic cuffs on legs and arms to keep out cold and dirt.