When the jacket is buttoned the fronts look short and you seem to have an erect posture. When the jacket is unbuttoned the back looks short and your posture more stooped. I don't know which is accurate as these are opposites.
Think you need 1/2" more length on the jacket, regardless.
Thanks, Despos. I will post some pictures in a t-shirt later today for a more accurate posture assessment.
When I unbutton the jacket it seems to swing backward for some reason. The opposite when I button it up. Its weird.