Hello!
I am fairly active in the Davidson Clan Society of North America, and you can find a good bit of information on the clan on our website https://clandavidson.org/. One page of the website includes information on the several tartans we have: https://clandavidson.org/the-clan/our-tartan/. The Davidson of Tulloch is not as hard to find as the website makes it seem, and is worn by a number of members. The most common seen at Highland Games is the Davidson Ancient, often in Marton Mills PV. I have never seen the Double Davidson or Davidson of Tulloch Dress "in the wild".

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