As a fully paid up member of Clan Forsyth (my mother's family name) can I just say:

(a) I found the clan connection helpful in picking out tartans from the vast array of possibilities on offer (far too many to consider) and I suppose I wear the clan tartans with a bit of extra pride.

but

(b) I don't want to stop anyone, Scots or non-Scots, from wearing my clan tartan. I take it as a great compliment if they have chosen "my" clan tartan. If I ever had the luck to meet someone wearing one of our clan tartans he (or she) would get an extra warm greeting from me. In a sense I suppose I'd consider them part of the family. Given the very loose structure of traditional clans, I think this is an entirely appropriate feeling too.