I carried a 4” Colt 357 Magnum (41 frame) in a Bianchi Model 8L. It carried the heavy revolver easily and with comfort, fine leather and great stitching.
http://smith-wessonforum.com/concealed-carry-self-defense/184567-old-school-k-frame-concealment-holster.htmlI believe I currently own four pancake holsters for revolvers and two for autoloaders.
There are a number of manufactures that get in right. When I was on the job I might be wearing my weapon under a jacket or open carry on a belt, with the handgun carried as a secondary weapon.
One of my favorites was the Tex Shoemaker pancake holster for the 4-inch and 2.5 inch M19 and 66. I like the cant.
http://www.texshoemaker.com/PC-Hugger-Holster-PC.htm It is a little more difficult to find a pancake holster for revolvers then 20 years ago before the L.E. market switched to autoloaders. The Shoemaker pancake does a good job of rounding the profile of a handgun under a coat.
When I wear a pancake holster I run my belt into the back loop, into a pants lop and then into the forward lop on the holster.
I have a good fabric pancake holster; I have been impressed with it. I like it for those days that I spent a lot of time crawling around in the brush. Such activity beats leather up.
A S&W brand pancake holster made years back still does a good job of concealing a 3" Model 13 357 round butt.