Found this in another forum regarding Smartcarry holsters. This guy doesn't believe in holsters.
I carry a P-89 Ruger taped high on my back with one bullet in the chamber cocked and ready. This only comes in handy if the bad guy tells you to put your hands on your head though. And I always have to keep my shirtless sweaty torso turned so that the bad guy can't see the weapon taped to my back.