I've carried M-27, 28, 57 and 29's in Bianchi, S&W shoulder and Cylone holsters from 4 inch to 8 3/8 under hunting coats for years, (Ruger SBH's too).
At times I've carried my S&W 629 3 inchers in a Haugen Big Magnum holster as CCW. With a good belt and windbreaker or better it hides well but is heavy after a long day. I mostly carry K frame snubbies or a Colt Detective for CCW.
I did recently buy a S&W 325PD in 2 3/4 inch for CCW as I like the larger calibers. I ordered a Galco pancake holster for it which should be delivered this week. I plan on trying this out for it's light weight and .45acp capabilities.
I've carried it some now in an inside Carhart jacket pocket and had to check a couple times to be sure it was still there, it's that light at 22 ozs.
I've toyed with the idea of having a double shoulder holster rig made up for my brace of 629 3 inchers a hundred serial numbers apart. I'd like the New York reload concept but not sure how much I'd actually use such a rig.