Bianchi, as I recall, used to, or may still make a pancake three-belt-slot concealment holster for four inch K-frames. They were popular in certain circles for LEOs who carried their four inch revolvers as investigator or off duty. I think the primary reason for wanting to raise the holster so high was to prevent the muzzle portion of the holster from being exposed when worn under a short jacket or untucked shirt.

I don't think Bianchi was the only company to make such a holster as the design was popular during the later part of the revolver era. Also featured a thumb break retention device. Other companies might have been DeSantis, Don Hume, and Strong, even possibly Galco.