Let us know what you decide to do! that's an interesting one.

Being self employed, every new client I visit is effectively going for a job, yes I know it's a bit different, my livelihood doesn't hinge on getting just one client, but I've not had really any problems or bad reactions. It's either a non event or they make a nice comment.

I would say that if you want to work at this job kilted - it would be laying the groundwork from the start to go for the interview kilted.
If you think being kilted would harm your chances of getting the job then it may not be worth it.