I just noticed this in the Current News section of the Stillwater Kilts website:

SOLID GREEN Wool Heavyweights are in stock (most sizes), they should be on the store by the 2nd week in May. E-mail us if you want to order one before then. Same "Shadow Tartan" fabric as our other solid color Heavyweights. It is a "bottle green", same shade as the green used in the Black Watch tartan.

http://www.stillwaterkilts.com/