A nice-looking quality double loop holster. Like an 1880's Cowboy, I used to soak my hat, boots, or holster in water, then put it on and "wear it" until dry! I don't do that anymore.
Over the years I have used different methods of "breaking in" a new holster. Grease the gun on all parts that will be in the holster. Then start at the muzzle and wrap the gun with aluminum foil, covering all parts that will be in the holster. Aluminum foil can be molded closely to the gun's contours. Then slowly slide the gun in the holster. Wet the surface with a sponge where the holster is tight on the gun. Then let holster dry (in the sun is OK). Then slowly remove the pistol, re-grease it lightly and slide back into that holster (not recommended on a leather lined holster).
This is just one idea - there may be other better ones.