www.mistymountain.com Gym Dandy harness. If you do not like the quick adjust for leg straps, call them and ask for "Goose", tell him you want the gym Dandy without the quick adjust on the legs. He'll do a custom order for you.
Either standard or custom Gym Dandy. Then get 2" tubular webbing and 1" tubular webbing. Use the 2" as a sleeve through the gym Dandy waist strap, add 1" tubular webbing inside the sleeve and waist strap with water knots on each end and you have your RC harness and a linemans belt that will not detach from the harness.
Check my history, I have posted about it and added pics.
I also have the BD Couloir harness, and it sits in its bag never to be used.
That works the best for me.