That's my problem with "made up tartans" that are not recognized by more than one party.
Thompson refers to these "tartans" as Bumby tartans -- no idea why, or where the term orginates, but basically, they are "erstaz" tartans (I really don't like using the word to describe them) that the clothing industry has come up with.

I'm with Colin; I like the legitmacy of registered and recognised tartans.

Cheers,

T.