If I missed it, I'm sorry, . . . maybe someone else said it: you have the cart pulling the horse.
First, . . . most important, . . . has to be, . . . figure out WHAT you are going to carry.
Carrying a double barrel derringer is as simple as putting it in a small leather holster behind a Western belt buckle. OTOH, . . . a Desert Eagle .50 takes a bit more planning.
Once you decide WHAT you will carry, you can then look at the options. I have a leather vest that will hold two medium size revolvers or semi auto's and no one would have a clue they are there.
You can find options on Google, . . . "CCW Holster: Colt Anaconda" or something to that effect. Be prepared to go through several pages, . . . many of the posts will be the same, . . . or similar.
But seriously, . . . find the weapon with which you are the best, the most comfortable, the most intuitive, . . . learn to dress / carry around it.
Right now I've lost almost 30 pounds in the last year, . . . still carry a full size all steel 1911, . . . don't have any plans to change.
Go with what you are good with.
May God bless,
Dwight