I had a treesaddle with the shoulder harness style straps. It was a pain in the butt. I now have the deluxe leather model without the shoulder harness straps. You don't need them. They're just in the way. I also had a treesuit and didn't care for it. The treesaddle is more comfortable and easier to carry while strapped around your waist. The woodpecker drill and 3/8" bolts is the ticket. Kneepads are a must. Everything needed for climbing can be stored in the rear cargo pouch. Just grab it and go huntin'.
As far as changin' clothes, well, I can take off, or add a jacket, but I don't think I'd try coveralls.