I have some fairly recent BB button down shirts in size 15.5-33. The collar fits me, the sleeve-length is OK, but the shoulders are too big. I'd make them about half an inch narrower on each side. I also have a pretty old 15-R BB ocbd: while the collar is a bit too snug, the shoulders fit me OK. Now, would ordering a 15.5-32 solve my problem? In other words, does the body get smaller as the shoulder/sleeve size gets smaller, or do they just make the sleeve shorter? Thanks!