One of my regular customers at the coffee shop recently gave me some tartan fabric, a lady's kilted skirt in Stewart Red, and a Clan Scott kilt pin. She said a friend had gotten them on a trip to Scotland years ago, and gave them to her years ago when she was clearing out her closet.

The fabric is all wool, heavy (the two yards weighed in at just over two pounds), has a remarkably nice selvedge - looks the same as my Dalgliesh tartans, and the dimensions are very even between the warp and weft (the squares are actually squares)
I went so far as to check the thread counts in the sett - starting at the thin, light line - sage 4, black 2, red 6, green 4, red 18, green 32 - as rendered below



It's almost identical to the Princess Margaret Rose, except what would be a white line, is a light straw/sage colour instead.

Any help identifying the tartan would be great - I'm stumped.
Thanks in advance!