One thing you might want to consider is that often workplaces which do not allow kilts (for reasons other than saftey) do not actually have an official policy against the kilt, but act as if they did. And when the issue is raised, it is not uncommon for them to give excuses which are equally applicable to women in skirts. And as has been mentioned, they often do not treat it in the same way that they treat other traditional garments from other cultures.