maybe she has a problem with what she thinks the kilt entails...."no underpants"
That has come up in conversation several times about my wearing kilts to work (which I do when I'm off the clock -- for a social function or to drop off or pick up paperwork).

It's a bogus argument for three reasons:
1) The trousers I have to wear on the job show the outline of my male parts while the kilts totally obscure them.
2) There are more layers of material between my rear end and whatever I'm sitting on when I'm wearing a kilt than the two flimsy layers of material when I'm wearing trousers and underwear.
3) For me to be exposed in the workplace, either I or someone else would have to make a deliberate effort to raise the kilt -- with all the awful consequences that would follow.

When I worked for another company years ago, I attended a company picnic. One of the managers sat across from me wearing short pants. It was very obvious to me and anyone passing nearby that he wasn't wearing underwear under his shorts. I'm just glad he was concentrating on eating a hamburger instead of engaging me in conversation. I quickly moved to another table.

As garments go, the kilt is rather modest. Still, people have their preconceptions and prejudices that we have to deal with.