Short answer: I don't think so.

I think that "my" tartan is Royal Stewart. My only kilt is in Navy Stewart, but I am not sure that I can claim that is really my family tartan. Navy Stewart is a fashion tartan. Even though I have found about 100 tartans called Stewart (counting ancient, weathered and modern colours separately, but not counting the geographically specific ones), I am not sure if any of them are "official". As far as I can tell, there is no clan chief to decide.

But between the Stewart, Nova Scotia and British Columbia tartans, I can have as many kilts as Hamish and can claim them all as "mine."