Haraka ...
This isn't quite the right parachute shoulder strap, but the 'lug' design is certainly the one I remember going into the Parachute QRB.
Image Credit : Unknown
When wearing a Life Preserver (either the old grubby yellow one or the newer green thing with rosary bead inflation handle), the parachute shoulder straps would 'kink' under the inflation collar just above the parachute QRB. Presumably the current mod makes things a little more comfortable. Yep ... I notice HRH isn't wearing a LP (clearly he wasn't going near the water that day).
Anyway it was a mark of pride that one could strap on a parachute standing up before entering the cockpit and then tightening up before strapping the seat harness around oneself
Best ...
Coff.