Thanks for your replies. When I hadn't heard anything for a while, I discovered that if I rotate my Thunderware ( similar to Smart Carry) holster to the side, it holds the gun against my torso, allowing a shirt to be tucked in. It may be the perfect solution to a tuckable holster, and there is no buckle or other attatchment to the belt that may be seen and recognized. The Action Carry holster may be able to be adjusted to work similarly. I don't have one.
Benjamin