Crosman pistol holster
Don't look for us to laugh at your ingenuity. My only question is, how durable is the material, it is made of? If if fits, and you are comfortable wearing it, then that is a plus for you. Your idea sure is worth looking into, especially for us in the Forum, who cannot lay out as much as $300 for a holster.
Back before there were 100's of holster manufacturers, the old "Jawbones", (detectives) working as undercover, in my agency, used an even simpler devise..A length of rawhide with loops tied at each end, one for the barrel and one for the grip, with the rawhide secured by your belt, and carried inside your trousers. Crude, cheap, but it worked. You could not make a quick draw with it, but, as most of you know, the average LE shootout is ten feet or less. The first accurate shot goes home. A detective had to be very familiar with his "piece", and that is what mattered most. Competency, familiarity, and accuracy with your duty revolver, stacked the cards in your favor.