Check with Cabela's. I found the exact holster your looking for, for the exact same pistol. My wife is a south paw and carries the Pt111. We had some trouble finding a holster for her but eventually came across it at Cabela's.
Edit: sorry I misread the title. Just realized it said 1911.
Si vis pacem, Para Bellum.
"If you want peace, Prepare for war"