Some people have long arms and others short and yet jacket length is usually best at brow of the seat. Caveat again (maybe I should put it in my sig), new to this, but what I picked up, there are three 'rules' regarding this: 1 (the easy one) - should be able to curl fingers around bottom of jacket. Agree with the shortcomings you mention. 2 (the aesthetical one) - should cover your behind. 3 (the theoretical one) - should divide body (minus head) in half. Still, I don't think any of these 'rules' should be set in stone. If one part of your body appears disproportionate, it's probably a good idea to start tweaking. -somebody correct me if I'm wrong.