Ralph
For ejection seat operations, we had a green US-issue net vest, with the holster on the left side under the arm. Comfortable and practical, didn't know it was there and didn't snag on anything. The floatation devices were separate, sitting under each armpit, above the holster.
Now this was a while ago with the 9mm Browning, before we then moved to more exotic weapons like the PPK. Also, on the right side of the jacket we even had a butt extension for the Browning, an attempt to make a basically inaccurate pistol more accurate. Fortunately I never had to use in anger.
Good luck mate.