I wear a uniform most of the time when I'm at work. Sometimes though I come in during times when I'm not expected to respond to emergencies and so I come to work in my regular clothing - usually a Utilikilt.

My boss and his boss have both seen me at work kilted and it's no big deal.

One of my co-workers asked me "the question" just this past Monday when I came in off my regular shift to handle some paperwork. I assured him that, while I typically wear my kilts in the traditional manner, when I'm at work I use "secondary containment" (a hazmat term). He, being very conservative, was quite relieved.

I'm very happy to be working for such a progressive company.

Your mileage may vary.