But most of our name tartans aren't like that. Most began life as anonymous patterns and were assigned to clans by the weavers or absconded by the clans themselves as the Royal Visit approached. Many others were designed by a pair of mental Englishmen and were bestowed upon various clans as part of a deliberate hoax. I myself don't regard such tartans as genuine clan tartans, given their origin and original purpose.
If the Chief of the Clan recognizes them, then they are "genuine", regardless of their origins.

T.