I am no expert , but I think the noun is tartan . I believe all other words , terms and names are adjectives regardless of their order . For example , Stewart Hunting Muted tartan .. versus ... Hunting Muted Stewart tartan . Either way , Stewart , Hunting and Muted are adjectives of the tartan .

One way may sound better than the other , but I think tartan is the noun as opposed to Stewart . I know that the name " Stewart " is implied as a tartan but it is not a noun .

Just my friendly observation , I could be wrong .