I have been looking for years for a hat like Mat's. Does anyone know what the style is called and if there is anywhere that sells such a thing?

Other than the feather it seems to be a western cowboy type hat that is sort of rare and not the classic shape. I saw Clint Eastwood wear one in a western. Stevie Ray Vaughn's was similar.

http://www.locusmag.com/2006/Issues/03jordan_270x360.jpg

 

that is a link to a picture of robert jordan, i think that the hat he is wearing is probably very close to what mats hat is like.