In my experience (girlfriend, not wife) it matters quite a bit what type of kilt and how I wear it:

- My lass doesn't much care for modern kilts (Utilikilt et al.).

- If we're going out in public, she likes to see me kilted up nicely. This is usually reserved for special occasions or big events.

- I sometimes wear a kilt very casually around the house when my lass is in sweatpants and we agree not to complain about each other looking like a slob...

Before giving any advice to the OP, I'd like to know what type of kilt and how he was wearing it? I'd also like to know if he asked his wife if she would approve of a different outfit, or the kilt being worn on a different occasion?

If she is categorically against any kilts, ever, then I'm sad for the OP