Do you fellers prefer a single strap that attaches in the center of the back or the X style with 2 back straps?
A guy I know gets the Amish to build his. The ones he gets are the nylon coated straps with buckles on each side of the front, about tit high, maybe a little lower.
Same style material and buckle as a dog collar on the length adjustment.
They even use leash type snaps where the suspenders attach to belt loops.