This smock was originally issued for Mountain Warfare training. Pattern is very similar to the windproof smock, but it is made in heavier denim.
Chest size (Jacket laid flat on a table)
Small(armpit to armpit):19 inches
Medium(armpit to armpit): 21 inches
Large(armpit to armpit): 23 inches
XL(armpit to armpit): 25 inches