The full size 1911 can be carried concealed rather well provided you're willing to make some concessions in clothing, you're most likely going to need to dress around the gun so to speak, this can be done with anything from a polo shirt to suit coat etc.
Before we get to the part about holsters and stuff. Is there any physical reason you are planning on carrying a .22? Arthritis or any other physical disabilities? The .22 offers very little terminal performance often referred to as "stopping power" and .22 ammunition is probably the most failure prone ammunition on the planet, add in to that that .22 caliber semi-automatics are not known for running like a Swiss watch, the end result of that is a failure waiting to happen increasing your odds of getting a click when you want a bang.
If it's the only gun you have, it's the only gun you have but please make plans to increase your caliber as soon as possible. If for physical reasons you can only handle a .22, I'd make it a .22 magnum revolver in order to increase "stopping power" and have a more robust firearm.
Now, on to holsters and concealing the 5" 1911....you're going to want an inside the waistband (IWB) holster with wide-set mounting points such as the Crossbreed Super Tuck, or renditions of the Versa Max II (my preferred IWB).
Small of the back (SOB) is generally not that great an idea, there are a number of issues to consider:
1: Draw stroke, if done incorrectly, you're going to sweep your torso with the muzzle of your gun
2: Not comfortable while driving, of course this will vary from person to person but I've done it and know of many who have tried it and it's not very comfortable while on the road and almost inaccessible while seated in a vehicle.
3: It prints like crazy when bending over
4: If you ever slip on a patch of ice and fall on your back, it's going to hurt really, really bad.
Generally speaking, the best place to carry is anywhere from 3'clock to 4:30 on the body (your belt buckle is 12o'clock)
There's also "wearable" holsters such as the Smart Carry, Thunderwear etc. but those all have their own issues, mainly accessibility.
This is a pretty good article on concealment holsters for the beginner, take read and come back with any questions.