I think Rex has hit on to something. Women can be just as " protective " as men about thier s/o. Or perhaps she is a little jealous of all the attention
( real or persieved ) that you get. I do agree that you should continue to aclimate her to the idea that kilts are for everyday occasions. Don't, however force this on her, but give valid reasons such as comfort, testicular health, and the fact that you want to look good for her.