I ended up with one of these in large after a warranty issue with a IHSH-33. The 320 is way long in both sleeves and torso, but the shoulders and chest fit well. I'm wondering if I should try to intentionally shrink it via warm water and dryer, and how much it might actually shrink?
I know garments will typically shrink more in length than width, but if the chest width shrinks any it's going to be too tight.