Deadstock French workwear  or leisure 'sports' trousers.
Circa 1930's/1940's 
 
Straight wide leg fit with side adjusters on the waist, and buttons on the inside of the waistband to attach suspenders. In beautiful unworn deadstock condition with the original tag still attached. 
 
Measurements in inches:
Waist 30.5” (can be sized down with the side cinches)
Inseam 29”
Front raise 14.5"
Bottom leg opening 11”