We can learn from even the newbies
This will surprise you. Here's a pic of a major "boutique" maker's holster. It's a slide, a kind of half-pancake, and the cut and moulding look v good from the front.
But a look at the back reveals something's not quite right, because the maker has made an assumption about the holster type: that the back should be the same size as the front, and big gaps have appeared on either side of the pistol --
OK, here's a maker (on eBay) who doesn't even put his name on his product so I'm going to call him a "newbie", though I mean no disrespect. And I say "no disrespect" because have a look at the back of his holster:
Dead flat. You can see why when you look at the front of the holster:
The front and rear panels are different sizes; the rear is smaller, so the front can shape away from the person's body.
So? you ask. So the first holster will cause the belt to snake along the back of the holster and pull either slot hard against the body, and the pistol even harder; and the "pocket" will squeeze shut when the pistol is out. In other words, uncomfortable, and the "adjustable tension" is your belt buckle!
The second holster allows the belt to lay flat along the rear of the holster, and the "pocket" is unaffected by the belt tightness, and the hard pistol is not being winched against your pelvis.
Look for this on your current supply of pancake style holsters, or your future purchases. It reveals that some very big assumptions are being made by our "boutique" players, that even a mass-maker like Galco or Aker doesn't make. And, yes, likely the "newbie" copied the Galco.