RE: Full body harness vs old style belt harness
If you bother to take notice all treestands come with some sort of full-body harness. This is an industry standard since 2004. No more belts. There is a reason why. It covers their butts in law suits. It also covers yours in case of a fall.
Sure some are more restraining and uncomfortable. Shop around and see which ones might suit you better. But don't go back to the simple safety (death) belt.
One thing you can learn to do is wear the harness under your jacket and pull the tether out at the collar. This will eliminate the possible interference of the chest straps with the bow string.
I advise a lot of people about the need of wearing a full harness. Some are unwilling to buy a good one because it might cost them about $100, but they are not averse to buying lots of life insurance that costs several hundred each year and they have to die to die to collect on. DUH!!!!!