Though i think Vanson do cut the upper arms wide in general. Very big in my Model B, more than could ever be needed. A hair big, potentially fuctional, in my C2.
I think they do that as a way to improve forward reach without needing to increase chest size or add gussets or footballs.
Most of my jackets with poor forward reach are like that because the biceps are so tight it pinches the arms.
My ELMC Californian for instance has some of the tightest arms at bicep level, and some of the poorest forward reach, it's very obvious during wear that this is because of the arms and not the chest/back.
My DD JH-1 is the same, the body is huge, but once again because of the tight biceps reaching forward is a nightmare.
Sleeve rotation and bicep diameter do a lot more for ease of movement than we think they do.
Knowing Vanson, they aim for functional rather than beautiful, they probably increase the arms to to the point where they are large enough to not impede reach and don't worry too much about the catwalk.


