Since I have a Houston mailing address, but live in an unincorporated area in the next county I dodge the bullet on jury summons most of the time. But if I ever get one, I will show up kilted.
Most judges around here are pretty strict about court 'dress codes', and they have absolute power about what happens in their courtrooms. I know a guy at work who had to re-schedule a traffic court hearing because he was wearing shorts and the judge wouldn't hear his case!
I think someone wearing a kilt to jury selection around here would just get labeled "eccentric" by the lawyers and not picked, but you never know.