Personally, if my mother-in-law had been laughing at the thought of me wearing a kilt I (A) wouldn't care because I wear a kilt all the time anyway, or would toss the whole idea of dressing nicely, and worn torn, stained jeans, a heavy metal tee-shirt, and the rattiest, smelliest shoes I could find. Tell her she gave up the opportunity to see me dressed nicely. Or I just wouldn't have gone at all. If she can't play nicely, don't play at all.

Andrew.