Ghandi swapped western style dress for a simple dhoti because he felt he would be more like the vast numbers of his people who were in poverty.

Work will often dictate what one should wear and even where there is no dress code then circumstances can still have an effect.

I do not know the ages of the people with whom you work - it is possible that some of them own a kilt obtained during previous times of plenty or have inherited one.

But there is still that "special occasions" mentality and work is not often seen as a "special occasion."

Luxury is one of those difficult things to define. We need clothes and a kilt is an item of clothing that many of us prefer to certain other garments. Would it be seen as a luxury to own more than one pair of trousers or socks or shoes?

Of course besides the kilt there are the other accessories and one can indeed spend a small fortune upon some of these, especially the formal stuff which one would not wear to work in any case.

A casual kilted look would not necessarily indicate extravagance or elitism.

There have been old photos shared in these forums showing the poor wearing kilts - possibly hand me downs but indicating their longevity and durability.