I don't get it. The hat is 'European Hare Fur Felt?'

Maybe Groenewold's business is coming from the traditional hat makers who are getting business, and not the official Yellowstone hat itself. I got this website (Stop the Scenes) off a video that said they had partnered-with the company that made the TV show which is how they were also able to recreate rooms from the tv show. Who knows.