Let me start by saying that your attempt to be unique paid off. I have been doing leatherwork of all types for over 35 years now. Holster making is of it's own, a creature that is hard to tame... I, like you started modestly years ago, and started making my own duty gear for Law enforcement, due to the fact that there was something I did not like about store bought goods. Through the years I have developed and improved all the accessories and holsters, and have field tested all of them. Pancake holsters are a half breed of compromised duty rigs that are more convenient to wear. Your holster has a strong developement, and the proper cant that has been tested by the Air Marshalls and FBI. It appears that the cant you developed is close to these, so that the weapon can be accessed while sitting or driving. I however would do away with the clothing shield that is excess. It will eventually break down and get in the way, making it difficult to reholster the weapon after use. The basic holster itself is sound in design, but missing a retention device to keep the weapon in place in case of spills, or in most cases an attempt to gain control. This is easily rectified by using a T nut in 8-32 threads, a hex head screw of about 1 1/8", a small piece of auto vaccum hose 1/4' ID and a saddle washer. Placed just below the trigger guard, these items work more effective than a thumb strap. Trust me when I say that a few cows died in vain during my research and developement stage, but now I have repeat customers all over the world, that utilize my products. Stick with it and look at the designs used by the commercial makers, that can be implemented in your personal designs. The day we stop learning is the day they fill the hole in behind us... You have a strong grasp, keep moving forward.
Daniel.