I use a rock climber harness. Misty Mountain Harness I figure I'd get the best. If it's good enough to hang from the side of a mountain a thousand feet up it's good enough for 25 feet up in a tree. I use a locking gate beener and 15 feet of climbing rope tied in a big loop that I wrap around the tree, through the loop and hook into beener. I wrap it as high as I can and still be able to sit. If I fall it should have me in a seated position at stand height. You can also use it for hands free stand hanging and leaning completely out of your stand. I once used it in a small tree without a stand. (legs got tired by evening though) If you get a sport model you can adjust the leg loops and fit it on the outside of your clothes. Hope this helps.

FYI I have the Cirque Harness model.