Ronstew,
I think there may be some confusion on what Tartans we are talking about here.

Piperdown is the guy in this photo in the Argyle jacket and the red and green Kilt. He is holding on to his wife in the darker red and green skirt.

Both of these Tartans are different versions of the McKintosh or McIntosh.
Modern on the Lady and Hunting on piperdown.







This picture of our piper and this of Hamish are of the same Tartan, Buchanan Old Sett, Weathered.