While Blkhawk73 is correct, the questions you need to ask are along these lines. What are you going to use the gun for (camp gun, fishing protection, hunting, etc.) ? What will you be doing when wearing the gun (walking, horse riding, atv riding, etc.)? What kind of weather will you be in?
With that being said I have a similar gun and went with a Simply Rugged Loaded Pancake (a pancake style holster with 6 cartridge loops on the outside). I also bought the shoulder holster add-on as I can see wearing under my coat/jacket while on an atv out in the woods or stream/lake fishing). I like the holster alot.
I would like to have a cowboy rig because I think they're cool, but it's not practical where I live and I have an expanding/contracting waistline problem.