I pretty much only wear a suit to church these days, but have never had a problem concealing in one. Strong side behind the hip with a good 2 or 3 slot "pancake" style rig works for me.
Last Sunday it was G17 on the right in a BladeTech total eclipse, G23/9mm on the left in a Glock sport/combat. Spare mag behind each, BladeTech single carriers. Bianchi belt.
I'm average build, in shape FWIW.