Told NO!

[Robin]

Take your loss...and have a nice evening out.

You can't solve this in 1 day without a serious argument I think.
Start from scratch and wear your kilt (casual) when you both go to a mall. When she figures out people like to see a kilt she might change her mind.
When you start a fight...she will hate your kilts forever and the war is lost.

Start a well planned guerilla war

[M. A. C. Newsome]

I know all of us really love to wear the kilt as often as we can, and some of us are full-time kilt wearers, but at the same time we have to be aware of one of the realities of kilt wearing. And that is that when you go out in your kilt, you will attract attention, comments, and questions.

This can be a good thing or a bad thing, depending on how you want to spend your evening!

It's perfectly fine (and not a betrayal of the kilt!) to decide that you don't want to attract any attention to yourself and just "blend in" for the night. And it's perfectly fine for your spouse to make the same request.

Aye,
Matt