James,

But my question about this has still not been answered. Has the chief of Clan Donnachaidh actually proclaimed this tartan for his family's own personal use, or is this just a myth or rumor?

As I said, actual "chief's tartans" are very rare. And we know that in the nineteenth century this was apparantly being produced and sold simply as a Robertson tartan, with no reservations at all.

I would like to see something from the chief himself to verify is all, for the reasons mentioned in my previous post.

Aye,
Matt