To add to the Richard S post.
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If you are willing to sew the pocket down, you might also think about sewing a common button in the pocket, this can be used with a "button in tab" of Deer skin added to the bottom of the holster, [with a button hole added.]..
This is not likely to be employed, as most will not go to the trouble to add the button, and continue to want the holster to do it all. There is no *magic* in any make of holster, most of it is the user dedication to practice in order to gain pocket carry familiarity.
Another point...
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A looser fit can be provided, by request. This is not done by me as a standard feature. I get a wide range of commends from "too loose to too tight" Yet they are all fitted the same as they leave here. Loosening, by the user, can be accomplished by many different ways, as "Someone" mentioned earlier, my way works for me and those that have tried it...