Coming from this 6'2" 320lb guy, most holster options are available. With the right holster and belt, you can conceal an RPG.
If, like me, good gun belts are hard to find, (54") have one made. Ray Cory @ LoBo Gunleather just made me a new one and it's great. Somewhere around $80.00 and about 5weeks.
I prefer OWB, at around 3:00 or 3:30ish, strong side. I have carried cross draw with an "N" frame, ankle holster with a "J" frame, and a 1911 in a "*******" shoulder rig. They all have their purposes. You'll have to experiment with a few and decide what's best for you. If you have a friend who carries, odds are he (or she) has the required bag of holsters somewhere and could loan you some for trial. Then you can avoid the "bag". (I counted mine the other day and I have 17, not counting my EDC holster).