I live in a very "alternative" area of Sonoma County California and I've never seen a person in a kilt (other than myself) just going about their daily business, and my wife (who is a second hand fiend) has never run across a kilt in a thrift shop. I think that the US kilt fashion boom is starting in rural America and gradually, very gradually, working it's way out into the more populated areas--Seattle excepted, of course because of the UK.