Consider this; when I had jury duty last year I wasn't even selected as one of the jurors yet I had to sit for approximately 4 hours before I was dismissed. In fact, sitting was all I did. Personally I would not want to sit for that long wearing my kilt. First of all there is a good chance that I'd mess up my pleats. Secondly, sitting atop 8+ yards of pleated wool can feel kind of lumpy after a while. I love my tank and find it more comfy than trousers in a lot of situations, but sitting in a hard chair for extended periods of time isn't one of them (I don't own a casual non-wool kilt so I don't know how they are for sitting). Just for practical reasons I would avise against it.