zoomer said:No windflap? Navy-type front? How about an Army AN-J-3? Note dark color, biggish pockets (are there buttons?) and lack of obvious hardware at collar.
More likely still is that it's some civvy model. AN-J-3s were very rare in the Army, and this drapes like horse rather than goat anyway.
Finally, Gramps appears to have filled out in the face between wartime and '49. His Army jacket might not even have fit him any longer.