I know you asked about leather, but if you are open to considering Kydex, I make them and could do something for you. The OWB design I do sits close in to your body and conceals well. I’m attaching a couple pics as an example. It carries well for long periods of time.
Full sweat guard. Can cut for an optic if you have an MOS model. The one in this pic is also cut to allow for a longer or threaded barrel if you have/want that feature.
