By the way, I've had a harness save my bacon before. Climbing stand. On my way up. My boot laces somehow got tangled with the cotter pin that holds the cable in place on the bottom part as I was going up. Alla sudden, cable pulls out, bottom drops free, and I drop free, hanging in my harness. Luckily I had tied the top and bottom parts together like you're supposed to, so I was able to hoist my way up into the seat on the top part just with upper body strength**, then pull bottom part up, then for a substitute cotter pin, I used something I found in my fanny pack - the pointed auger part of a little screw-in hanger for sticking in a tree and hanging stuff on, to re-connect the cable on the bottom part (tricky though). Then I finished hunting and later was able to climb down. Moral is, take a substitute cotter pin, follow the maker's directions, and always use a good harness.
**Note that this was not too easy and had I been a fatbody this would not have worked - my only choice would have been to dig around for my pocket knife and cut my harness and fall to the ground - but at least it would have been expected and feet first. Or maybe just shimmy down the tree. Either that or hang there until I became a frozen hunter-sicle.
I also prefer to have a neck knife for easy access so that if you do have to cut your strap you can. A cell phone and a whistle are not bad ideas either.