I agree with Grey Fox, as to the reason not to carry SOB. The chances of you falling are small compared to a jacket riding up and over your SOB. The other reason is you can't protect your gun back there, you may have a situation that someone could pull the gun out easier than you.
With that said, I have a Galco SOB for my hammerless Smith & Wesson revolvers. When I use this mode of carry, I sometimes feel the gun flops around there way to much. It is somewhat uncomfortable to sit for long periods.
I like the concept, but reality set in after trying it out several if not many times.
It may work for you.