I learnt about harnesses by that.
During my time as a Winchman, Trainer and Examiner on both SAR and Support helicopters I always tried to impress those I flew with that the despatcher's harness was to stop them falling out and not to arrest their fall. Crewman, especially on Support Helicopters, would often lengthen the harness so as to be able to look underneath the aircraft or to reach the farthest parts of the cabin. It was brought home to me when we suffered a double engine failure during an approach in the mountains and, when everything had stopped and the Sea King was lying on it's starboard side minus sponsons, I was lying on the cabin door which I had quickly closed, contrary to the crash drills. If I had left the door open and had lengthened my harness I would have been crushed. To return to topic I would recommend the Despatcher's Harness as used by the British military as being simple and foolproof and, with the ceasing of UK military SAR soon, there should be plenty available.