I'd rather not take a negative approach, but save your money. For those to work, they would have to fit very tightly and would require two hands to draw a weapon to prevent the gun from snagging on the way out. Dunno about pulling around and bunching uncomfortably with the weight off center, but can see that as possible. As undershirts, would work for concealment fairly well, with the obvious delay in digging out the gun, but you are still in two hands mode. I prefer keeping the weak side arm free for other duty. (Why I use OWB holster or pocket carry.) On the positive side: Superior for weapons retention. Good place to carry your wallet, comes to being in pickpocket country.
Yea great points, I was thinking for a back up weapon, never thought about the wallet idea, that would work.
