The drivers of that era truly needed a second casket for their giant manhood. Or someone to check them into the nearest asylum. No harnesses just so you could run a bit lighter; they sacrificed nothing in the pursuit of speed.
I remember reading a story that at LeMans, back when they did that sprint-to-the-cars type of start, Gurney would jump in and blast off and wait until he got to the Mulsanne straight to do up his belts - while steering with his knees...