While the suggestions about holsters are good, I see no mention of the other part of the system: THE BELT. You aren't going to carry much of anything on the belts usually available in most stores. You need a good sturdy belt of the same width as the belt slots in your holster(s). Be prepared to spend some fairly serious money (no $7 wallyworld specials), but if you take care of it, it should last for decades.

Your local gun shop or maybe police supply may have a box of used leather products they've accumulated. You might be able to experiment on holster choice for very reasonable prices. Most of us end up with a box of holsters that weren't quite right for us.

It would not hurt to get your tailor involved in making sure the suits drape correctly. I think if you look around, you'll find folks who not only do this work, but some specialize in it.