I like the Askins Avenger from Bianchi, I wore one for a several years and it can be locked in place with a belt loop.
There is a lot to what Bruce Drake said also, I wish I had saved a few of the leather holsters when my various ships and shore commands switched over to the M9. By the way if you try to use a Biachi UM84 holster for a 1911 without modifying it the gun will fall out. To fix this poke a hole about 1/4" above where the welt comes together and use a small ziptie or piece of wire.
Robert