Chas's point is correct: he is your son and your wife's son. And a father does have things to offer a son that a mother cannot. A man should be a man and "man up" as we say in showing a boy how to be a man. (I won't get into what all that means.)

But she's only your wife! Wearing her down may work, but if she's as hard-headed as mine, it could back fire and cause her to dig in her heels. If it's going to be a fight, then you have to decide if it's a fight you want to wage; the decision may rest on whether you think it's a fight you can win. It is, after all, about a kilt, not about morals or ethics or nutrtion.

To me, it would be a thing worth fighting over because it speaks to one's manhood in some ways. But only you can decide about that. I would get him a kilt from Stillwater for 20 bucks and see where it leads for him in the future. The teasing factor is a specious argument.