Lawyers, guns & $$$....
If you review a few of the forum posts, you'll find a long list of top holster firms or shops that do great custom work.
Prices have jumped sharply in the last 10 years or so. I've seen a few custom shoulder rigs going for $350-450.00!
In general, depending on your budget & uses, here a few "big names"...
Don Hume, Milt Sparks, Mitch Rosen, Galco, Safariland, Bianchi-intl, Kramer Gun Leather, El Paso Saddlery, Blade-tech, High Noon Holsters, Tex Shoemaker, Bulman, Alessi, DeSantis, Blackhawk, Ken Null, Aker, Kirkpatrick Leather, Ted Blocker, Lawman Leathergoods, COM Holsters.
I'd suggest checking on styles, wait times, options too before you order.
Custom shops or some models may need special orders.
ClydeFrog