In addition to the MacLaren tartans for Wood Badge trained adults, there are two other tartans, called Scottish Scouts. I do not know if they are in production or require a custom weave.

The first is ITI#1294, called Dress Grey Watch, and based on the Black Watch tartan:


The other is ITI#1463, based more or less on the MacLaren tartan:


A couple years ago, I attempted an inquiry at the Boy Scouts of America (BSA) National Council to see if the BSA ever commissioned a tartan, but my inquiry was never answered to my satisfaction.