I thought the cut-out was for the officers piss-tool? But seriously, having practially lived in a DR coat in my pre car days, I can safely say, the snaps are not for attaching the coat to the bike, but they double up as a sort of trousers, if you bend over, and get hold of the rear flap, pull it upwards, then you can attach the front and rear together, making for a more watertight connection. also with heavy rain, and driving with the coat on, when the corner of the coat touches the HT terminal of the spark plug, it does conduct electricity! sure keeps you awake on long runs!
And that it would give you more protection in hand to hand combat is pure nonsense, you can hardly move with it!
If you had of met the guy that was selling the coat his listing might have made a little more sense. I think he had been up for a few days and I suspect the money from the sale of his jacket was going directly to his dealer........I thought about correcting him on the brass snaps but then figured I’d leave him with his well crafted thoughts.