Maybe the utilikilts aren't fancy enough. Time to bite the bullet and get a full dress tartan kilt. Tell her your a big boy and you can take care of yourself. I understand we all want to protect people we care for but we don't usually tell them to change so we don't have to be bothered.You might ask her what brought this on especially if it hasn't come up before.Maybe someone was talking trash behind your back and it really made her uncomfortable, or she knows something about the area or people you are going to meet. My wife has never asked me not to wear my kilt,now she has asked me to shave for her(I look scruffy enough without a couple of day hair growth on) and that is no problem. Hope you can get it straight,good luck. Now back to the tartan Kilt you really need one for those formal occasions

Good luck
Dave