the later wornout jacket is from 2002]
Long/short, had to resort to ebay. Got the deadstock effort for about 50% less than a new one; #find. Blanket lined sleeves, #must. This older jacket may be from the 1960's (no label to show material types, older C buttons, and no exterior label). Stiff as a board duck, darker brown than the caramely brown you see today. The blanket lining is not Troy Mills, though some (probably older) models (example) did use Troy blanketing. This may be 1970's then...
Last, the fit. A labelled 40" chest of yesteryear is almost exactly equal to a labelled 38" chest of today, which I would say is a real life 40"... 22" across the chest seam to seam. So new fit is vanity sized?? The pics are compared to my own worn 2002 Detroit throughout.