True, a 1911 is a large, heavy pistol. True, a smaller, lighter pistol would be easier to conceal. But if you dress for it and plan your clothing around it, a full sized handgun can be concealed. Just know the limitations going into the purchase. If it's your first firearm I would suggest a full sized pistol to get the skills down before you move to compact or even subcompact with a little dangle on the lower half of your hand. But a 1911, the right holster, and a good belt can beat a cheapo pocket holster and a mouse gun any day. Concealed carry is synonymous with compromise.
Personally, I like my SR9c for IWB concealed carry in warmer weather and my Kimber in a Blackhawk Serpa in the winter. The SR9c disappears with my Crossbreed holster. Galco makes a similar holster, but I haven't had the privilege of using one yet.