Viking, I think it would work on any kind of boot. The holster lacing is independent of boot lacing. Length of backing leather would vary.
Dwight, yes it is too flexible. This is the second one I made and the 3 rd or so pattern. It is 9-10 oz veg tanned, wet formed with gun in it and strapped to boot to dry on heat register. The pouch is rigid from wet forming. Should have been smaller but for sure no way to extract from a tighter holster. I am thinking a metal plate behind inner leather strap to keep it rigid. The commercial one I saw was Kydex. I don’t know if it’s legal to post a commercial link for an example here. And yes it’s fine to pick on it. Need an idea that works. I can’t machine sew more layers or I would double layer it and that weight leather is about as heavy as I seem able to work with. That gun also fits perfectly in my Niteize cell phone holster. Might need complete holster attached to strap. I