I've really been happy with the "Seat O the Pants" full body harness. The only problem I have with full body harness is it renders your pockets useless. So my lovely wife put a slit just below the neck in the back of my Scent Blocker suit where I can thread the strap through that I attach to the tree. Kind of looks like a big button hole. Works great.

The harder I work, the luckier I get!