Ken Null's SMZ rig. If it had an X-harness, it would be perfect. As it is, it works great under a shirt with a significant collar. By significant, I mean stiff, as you see in dress shirts. Polo shirts don't work too well because the strap shows across the back of the neck.
Not me in the videos, FWIW:
YouTube - Ken Null SMZ with Seecamp LWS32
YouTube - Ken Null SMZ with Seecamp LWS32 (under Coat)
K.L. Null Holster Ltd. - Holsters
My own images, edited to remove evidence of riotous living.
There is a slight bump evident right on the seam twixt torso and sleeve, just about dead center. Not very noticeable, though - in person or on camera.
W/holster:
No gun in holster in this one:
