I wish the hats and jackets were as easy as the rest of their kit.
There are several hat makers out there, just google cowboy hats makers or go through the cowboy action shooting sites and you should be able to secure a company that can make one of their hats. As for the coats, I looked for quite a while last year for Sundance's coat to no avail. Plenty of corduroy coats out their, but no ones with such a side wale. Probably need to be a custom deal.
Good luck,
Sebastian