I guess I should update my entry...
The SIG Fastback didn't last too long as my carry gun because it wouldn't quite fit in a cargo pocket in a usable position. So I got a SIG Ultra Carry which fits perfectly. Here it is in the cargo pocket rig. The foam keeps it from shifting and prevents printing. The result is amazingly inconspicuous since there is no discernible outline of anything in the cargo pocket.
Note that due to the magwell, a Checkmate 8 round mag barely protrudes - just enough to make it easy to seat fully. All my full sized mags work flawlessly, so I never use Officer mags in it. Without a base pad, an Officer mag can't easily be seated anyhow.
I carry 3 spare mags in the opposite cargo pocket.