Looks OK if you are standing (in the above pic) but what if you sit?
Are there any safe, comfortable concealed rigs for a full-sized auto (i.e., SIG P226)?
I've had no problem with a S&W J-frame size snubbie in mine standing, sitting, running or even once practicing rollouts/breakfalls with it on. I had a larger one where I was even able to stuff a fullsize Glock 21 in it and could still drive and sit, it took an untucked polo to make it unnoticeable but it *is* doable if you wanna do that with the P226( Comparable size but the Glock 21 was wider so it may be a bit easier for you). The owner of that company carries a full size 1911 in his ( though I'm not brave enough for "Condition One" carry of a 1911 in such a holster myself).
Just remember that this is
not a quickdraw holster, it's a deep concealment holster, and as such is still better for medium to small frame guns.
You will probably need to use H2H or another method to create space and distance to draw( and hey, maybe you'll get lucky and that will end the show then and there), or get behind cover, or discreetly access it prior to beginning festivities if you know something's about to go sideways and can't get away.
More realistically for a full size gun like yours....
For the full size SIG like you have you must accept there will be limits to what you can comfortably wear and you may need to alter your mode of dress to accommodate carry( if you don't like, or can't hide, your gun/holster combo, you won't carry it, and the whole "armed citizen" idea really doesn't work if you're not armed, now does it).
I'd go with either this:
http://www.gunnersalley.com/product/H715MTB/Don_Hume_IWB_ClipOn_Holster_wThumb_Break_H715M_TB.html
Or This:
http://www.blackhawk.com/product/SERPA-CQC-wMatte-Finish,1145,1410.htm
Depending if you wanna go Inside or Outside the waistband( I recommend inside if you can get used to it, that way your concealment garment can go all the way up to the belt with no oopsie.
I have one of each of those above and the reason I chose them over others is because
each has a retention system that will not alter your practiced, natural drawstroke--don't EVER assume that just because you're carrying concealed that your customer will never discover its location( such as if/when they get close enough to try and get their arms around you and "bump frisk" the gun).
*The SERPA will keep that gun in long enough for you to access your backup gun(you
DID buy/
ARE gonna carry a backup, RIGHT?), swap off to hand to hand/stick a pocketknife in them/
whatever you must do to get him off that holster. Yet when you employ your natural drawstroke, out it comes.
*The thumb break snap on the Don Hume leather job will perform the same function( thumb breaks break *down*, when your hand settles into its firing grip, not *up*, as in a snatch attempt) and will secure your gun long enough for you to effect a "thumb break" of your own :EG:. Yet again, it adds no appreciable reaction time to YOUR drawstroke.
*The gun also can't ever accidentally fall out and can save you some very embarrassing public restroom moments

.
* The Leather holster, in particular, can clip on/off your belt, or on off your waistband and secure under your belt, and can be removed without having to draw the gun ( which if for any reason you must disarm such as during any sort of tense conversation with an inquiring LEO after you may have had to use it, for example( there is exponentially far less chance of any fatal misunderstanding.
So too can the SERPA if you install the Paddle attachment instead of the belt slide( it comes with both).
I use the SERPA as a belt holster for the range and the leather for carry (Only problem I have with the kydex/plastic holsters is they can break under the force of a snatch attempt, hence I like leather).
Speaking of belts, you will want to buy a dedicated gunbelt, built to take a holster/mag pouch--a standard belt won't do it and WILL make the rig uncomfortable/loose/prone to movement.
Here's the one I use:
http://www.blackhawk.com/product/CQC-Pistol-Belts,794,61.htm
Reinforced, but looks like any other dress belt and not one of these inch and a half wide, quarter inch thick Sam Browne jobs that scream "Gun" from across a room even when no gun is visible.
As to where on your belt it should go, here's an article by Gabe Suarez to get you started:
http://www.sightm1911.com/lib/ccw/carry_modes.htm
Then get back with me and we'll talk about pocket holsters and backup guns
