old WWII vintage khaki United States Navy officer's uniform tunic

Old vintage, US Naval officer's khaki tan uniform tunic or jacket. We've been told that this is a officer's khaki working uniform. This tunic still has the gold colored eagle buttons on the bottom two pockets.

The tunic measures about 17 1/2" long on the arm (from the armpit to the sleeve cuff), 37" around the chest (under the arms), 17 1/2" across the shoulders and 29" long from the base of the collar to the bottom in the back. This USN tunic does have some wear and spotting from age.