Nigel,

You might mention to your father that there is an Oregon State Tartan:

http://www.caledoniansociety.com/origindex.htm

http://www.oregonscottish.org/tartans.htm

http://www.district-tartans.org/oregon.htm

And, for good measure, the Oregon State Defence Force has its own pipe band:

http://www.smt-net.com/~thepiper/

Regards,

Todd