Can't personally recommend an IWB as I am totally IWB. I have tho lent to a buddy a beautiful 1911 OWB rig I have had for ages - made by Horseshoe Leather. They are in UK but can be found on the web with a search.
It fits so well that it's hard to see an IWB really gaining much, plus the need for larger pant waist etc. I expect a bit of digging on Don Hume, Galco, Biancchi etc would come up with some good options. You may also if you don't mind plastic, find a Kydex to siut from Fobus.