Family members, Mothers especially have a very stilted image of you. They see you with eyes that sometime have no bearing on the actual facts.

She probably means well, but this activity seems over the top. Arriving un-announced, is one thing, but theft of personal property is another.

It almost sounds as if this is a planned intervention of some sort.

What is your wife's opinion of your kilts? Is she supportive? With only two kilts, you must not be wearing them full time. You were at a business meeting without one of them, so you apparently dress "professionally" when dealing with business associates.

It’s some times bad that our legal system doesn’t have the ability to divorce your parents.

But at the end of the day, she will always be your Mother.

Keep your personal opinions to yourself, limit contact with her as much as possible. Remain civil. Work hard, become a success in your chosen area, and show her she is wrong about you, by becoming wealthy and independent. Change the locks on your doors. Do not allow anyone other than your wife to have access to your house or residence. If your children are old enough to understand, calmly explain the situation. Kilts are cheaper than trying to fight with family members over an extended period. The next time that you get a truly extra spare $30, get another casual kilt, and start over.

She obviously knows you well enough to understand which of your buttons to push to get a reaction.

Consider the kilts gone. They are replaceable