Unless they own their own business, supervisors/managers still generally have people to whom they themselves report, and with whom they at least *should* check before coming to work kilted.

I spent a couple of years as security manager for a nonprofit agency in San Francisco; came to work kilted (with permission) on several occasions and everyone loved it.''

Currently I'm the Director of Security for a Jewish institution and I'd certainly want to check with my boss, the Executive Director. But I am thinking of giving it a shot when Tartan Day rolls around in April.