Have you considered a belly band? I'm not sure the brand, I think it was Galco, but there was a BB that was being manufactured that allowed you to use any holster you wanted to, IWB or OWB, by means of two velcro straps. A Belly band may be a good option for deep concealment, but depending on the type may not work the way youd like. IMO, certain things have to be sacrificed to conceal a pistol. If I'm working with a heavy winter coat and a nice long shirt, then I can make my 1911 disappear no problems, but in the middle of summer wearing shorts and a t-shirt, the same pistol is going to be a lot harder to conceal.