Personally, I'd wear it and see what they say. After all, a kilt isn't jeans and it isn't shorts. The only thing I'd worry about is maybe getting slapped with a contempt of court charge, but I highly doubt anyone would want to bother (and I don't even know if they could do that anyway, since I'm no lawyer or judge.)

I think they should let you wear it, but I also understand that juries are supposed to be "transparent" (ie, they don't want people paying attention to the jurors, but to the actual trial itself) during hearings, and they may consider it too attention-getting. Not really right in my book, but realistically they might look at it this way.

I'd definitely (but politely) bring up the other ethnic garments mentioned earlier in the thread if they give you any problems though. Besides, it's not like you'd be wearing a beer helmet, sandals and Hawaiian shirt or something like that! (Although that would probably make jury duty a hell of a lot more fun!)