I want to share my good fortune with everyone that I received a really good leather holster at a very reasonable price for my P-01. It is a 1791 Gun Leather model BH2.1 configured for a Sig P228. They don't make one for a P-01 but I remembered reading here that the Sig P228 is close enough in some cases.
So I took a chance and ordered it. It came with directions to break it in. My gun fit really tight at first so I followed their instructions. I gained a little but it wasn't making much progress. So after a good night's sleep I took the next step and wet the outer part of it and then inserted the gun (wrapped in a heavy plastic bag per the instructions). This time the gun went further into the holster and it was easier to stretch the leather this time. I worked with it off and on for an hour or so before removing and testing.
When I was comfortable with the fit holding it in my hand, I put it on my belt and found that it needed to be stretched more. The next time it did much better. After a few draws and re-holsters, it all came together.
The holster is way thicker than the other OWB holster I have for another gun that works ok, but this one has much thicker leather and has double layers in places. Very heavy duty. I am happy.
Richard