A 1911 is a cinch to conceal and carry all day long as long as you spend some time and money on the proper wardrobe and a decent holster.
True statement - it just depends on how much you are willing to dress around the gun.
Not to flame anyone's choice but:
For some of us, style matters - maybe not to us personally, but to our employers and maybe some degree our spouses & children. Having clothes custom made by a tailor to accomodate a full sized, all steel handgun - be it a 1911, Beretta, HK, S&W, etc. - is an option many simply cannot afford (count me among them). The only other option is to buy clothes off the rack bigger to accomodate the bulk of the gun. For instance, pants that are big enough to wear an IWB may fit so loose everywhere else - especially in the back - that you look like....well, like your pants are way to big.
There is also the weight issue. Any good holster needs - and deserves - a good gun belt. But a pair of pants with a heavy pistol hanging off them needs a tighter belt than just a pair of pants. And, if you bought the pants a little bigger for the IWB holster, depending on body construction they'll tend to slip dowm over your hips with a belt that isn't good & tight.
My choice for carry, when I am concerned how I look, is my aluminum 3" Kimber in an OWB holster that tucks the butt in tight. I can wear normal sized pants and a sport coat or light weight jacket, maybe even a sweat shirt if it fits right. The 3" barrel is 2" less I have to worry about my over-clothing pulling up & exposing my gun, & the light weight of the gun is a lot easier on my belt.
The most unsettling issue was getting used to the feeling that the gun wasn't there - I would keep reaching back to make sure it was still solidly in place!
I do have an IWB for it - a VM II, that I highly recommend - that I wear with pants that will accommodate it. It works well, but I don't find it as comfortable as an OWB.
Also, I have a Galco Jackass rig that will accommodate either my 3" or 5" 1911 pistols. Again, it conceals both well but my shoulders prefer I carry the 3" aluminum gun instead of my all steel 5".
YMMV - but to me, anything that is smaller & lighter will carry easier than one that is bigger & heavier...