In your experience, how do you guys recommend sizing leather A2 jackets to maintain arm mobility when buttoned up? I'm looking at A2 jackets and find that they have a some variety of pit to pit sizes. My chest is a size 40, so how much bigger would you recommend the jacket chest size be? Right now, I'm thinking that +6 value sounds good, so I would be looking for one with a pit to pit of 23" or a total chest size of 46 inches. What do you guys think? I was thinking that a 22" pit to pit (or a total of 44" chest circumference) may be too restricting and anything more than 23" PTP/46" chest circumference may end up being too blousy. This is all assuming the jacket is just leather and lining with no insulation and is made of goatskin.