Here are a couple of thoughts re carrying a 1911.
I've been carrying for years but just started carrying a 1911 last year. It has been a learning experience so maybe you can benefit from some of my mistakes.
First, you should realize that the 1911 is slimmer than 9mm M&Ps, Glocks, or Ruger Pxx or SRx. It is MUCH slimmer than the .45 glock and M&P. Its probably also much slimmer than a .45 XD but I don't have any personal experience with that)
So now you have 3 other things to think about. 1) bbl length 2) grip length 3) weight.
I started with a government model. I found the bbl too long. It wasn't a problem standing, it was a problem driving. It was also a bit heavy. I didn't care because I bought the gun for range use and only carried it a little.
Next I went with a commander sized (4.25" bbl with full sized grip) gun and found that it carried and shot well.
About the time I got a deal on a used Colt Officers ACP. This has a 3" (about) bbl and a shortened grip. The gun I got was an alloy framed "lightweight" version.
It carried well, but I preferred the longer grip and longer bbl of the Commander.
Then I came across MY perfect 1911 on 1911forum.com.
It is a Commander sized Lightweight Nighthawk Custom Tallon II with a bobtailed frame.
The bobtail removes the corner of the butt that causes most 1911 printing problems and leaves the rest full length. So your hand has a full length grip to use and the mags still hold 8 rounds. Empty, this gun weighs 25 ounces, not that much more than what a Glock weighs.
In the interest of weight, stay wasy from full length guide rods and bushingless bull barrels. I've found that weight is a big factor in comfort.
Also, as others have said, get a good belt.
If you wear your shirts untucked get a wilderness concepts instructor belt. Don't even think about it. Just go buy one. It is the standard by which all other "tactical" belts are judged.
I can't stand how they look but it is my daily belt when I'm going to wear an untucked shirt.
http://www.thewilderness.com/storepinnacle/index.php?p=catalog&parent=142&pg=1
For tucked in use any number of good leathersmiths can provide you with a nice belt.
I have a very nice black 1.25" delFatti leatherworks belt. Its 10 years old and going strong because I don't usually wear a tucked in shirt with a belt or IWB holster. (Its usually pocket carry if I'm tucked in, in which case a gunleather quuality belt isn't necessary.
In summary, get a good belt, consider weight and how it affects comfort, consider comfort sitting and think about how much you want to print.
That leads me to another thought. In CT, we are an Open Carry state. This has just come to light in the last couple of years. Before that I used to shoot for 100% concealment. Now that I know tha I am legally entitled to carry openly I am much more casual about concealing. Ill put a Tshirt over a paddle holster. There is a definite bulge, noticeable to anyone who looks. But amazingly nobody looks. I can't tell you how astonished I've been. Most people walk around not noticing anything.
Also, in todays world, geeks wear all kinds of bulky stuff on their belts. There's no knowing if that bulge is a blackberry or a gun. Well except for the fact that half the time I carry, there is an inch or two of bbl sticking out under my shirt. Amazingly, I've never been "made".
Don
The top gun is my Nighthawk lightweight commander sized gun. This one was "just right"
The middle gun is my commander sized all steel Les Baer Concept VIII.
The botom gun is a Colt Lightweight Officers ACP.
All are .45
The Nighthawk is as much art as it is a tool