Before anybody jumps down my throat, I have to say, that I do not like Utility 'kilts', but would defend to my last breath anyones right to wear them - however, I would not. Therefore, kilts for me are for wearing when I am not in a work situation, or indeed any situation where an expensive piece of clothing is in danger of being damaged.
So it is troosers for working, and kilts for most other things.
This works well for me, as as so many others here have said before me, it makes me feel 'special' when I don the tartan.