I'm pretty sure it's made in USA. Just recently I came across their website where they talked about the materials being grown and made into cloth right here. It stuck in my mind that all they had available are solids -- and I really wish they'd do some marbles, tone-on-tone, or prints.
A quick search didn't bring up the site, but I think it was linked to from this website. Someone was laughing because they have an image that changes at the top of their home page, and one was of an old Singer-type machine stamped 'made in China'. Anyone else remember that?