I have four or five different leather 1911 commander size belt holsters from Blackhawk, which you don't hear a lot about, but they're pretty nice Italian-made leather holsters that sell for a decent price. I also have a couple of nice ones from Galco and DeSantis. For on-belt carry, I prefer ones with a thumbstrap, but you need to experiment to be sure the thumbstrap fits well and doesn't pose a risk of sweeping the safety to the off position when carrying condition one. This can vary from gun to gun, of course.
Blackhawk also makes a nice leather IWB holster with a metal clip that I like for tuck and go use... again, decent quality at a decent price. For dedicated IWB use, however, my favorite is the Comp-Tac Minotaur. Once it's broken in and the leather shield comforms to your body, you almost forget it's there.
