This is an education process, to put her at ease with your kilt, take her to some places where there will be other men wearing kilts. The highland games and Scottish festivals are a great start. With some exposure to kiltwearing she will see that many other guys wear kilts and this is a totally acceptable mode of dress.

Look up your local St. Andrews or Caledonia Society and attend some of their gatherings. Some Presbyterian churches have Kirkin's, these are usually very colorful and inspirational services with a lot of kilt wearers in the congregation.

My wife was slow to accept my kilt, now she looks forward to and very happily participates in every Scottish event we attend. A couple of weeks ago she asked me to order her one of those frilly ruffled blouses with all of the lace at the neck and sleeves to wear with her long skirt, long tartan sash and clan badge. She has been converted.

Proceed slowly there is hope. Look for events that both of you can attend where scottish attire is worn. She will become more comfortable with your kilt.