It's no different than concealing a medium frame semiauto. I normally carry a Glock 19, but I love my S&W model 10, 4" heavy barrel. I usually carry the Glock IWB but the S&W OWB. Just takes a little bit longer shirt to cover it. A t-shirt will work, if you get a dark shirt or one with print, some brands are longer than others.
This is my M10-6, but for carry I have smaller walnut grips, but they're well-worn, and the rosewood grips just look so much nicer. I've got another holster that has more cant to it, and both work well. I made both (see my sig). Concentrate on the holster in the picture, and don't look at my huge butt.