After dabbling with Detonics Combat Masters, Colt Commanders and an Officer's ACP in the 1980s that nearly ruined my faith any 1911's reliability, I returned to the 1911 in the mid-1990s with full-sized (Government Model-sized) 1911s which restored my faith, and also taught me that the full-sized 1911 is still eminently concealable, because slimness is what counts, at least on my tall slim frame. (6' tall, 31"-32" waist)
The SIG P220 I carried from 1991-1993 was reliable, and it's slimness made it very concealable, too.
My job requires me to tote a double-stack DA .40 on the clock, and because I prefer to carry and train for only one auto-pistol system at a time, my 1911 is mostly dormant these days. I am not worried about missing the thumb safety, but about trigger control. I am quite content with the SIG P229, even if it only has a .40 hole in the front end.
I do have a new-to-me "compact" .45, a Ruger Super Redhawk Alaskan in .454/.45, but I don't yet own a carry rig for it, so cannot say from experience how it is to conceal it. I really boughtit for future walkabouts in wilderness areas, not urban concealed carry, anyway.