I think Redshank has hit on something with his picture of Ern wearing the XMTS tartan. If there is to be a recognizable kilt in the photo, what better than our own clan tartan? Posting any other recognizable tartan is bound to cause issues (even if people are guessing at a barely/not recognizable sett!).

That specific picture might not be the perfect one, but I heartily recommend that if any kilt is shown, it be an XMTS.