Roy, while I have designed several tartans, I have registered only one.
I hope that in the long run it will be a district tartan for South Africa, but I have accepted that it must, for the time being, be listed as Fashion.
When the time comes I might try to have it listed as Other, although District would really make me happy.
Perhaps if you could organise an umbrella body for your hobby, incorporating businesses, societies and individuals, they might be able to put it through as Corporate.
Regards,
Mike