Re: 1911 thigh holster.
Eagle, Tactical Tailor, and London Bridge all have excellent products when looking for a nylon holster. You really can't go wrong with any of those. I've never used the BDS but have used the others I mentioned.
If you're looking for better retention but faster draw, go kydex with either a Safariland or Blackhawk Serpa. They have a larger profile and weight, but if you're going to be using it around potential bad guys, the retention features are really what you'll need.