Don't expect the change to happen overnight. If your father changes his opinion it will happen gradually. My wife was initially resistant to my kilt wearing, but she is slowly changing. The change came about as a direct result of the many positive comments I've recieved while wearing the kilt.

My advice would be to find times, and occassions when it would be acceptable to your father to wear your kilt with your father. On those occassions make sure you look your best; nice shirt, tie, hose, flashes,...the works. In short, dress like, and act like a complete gentleman. Over time your father will begin to realize that you are recieving positive reactions, and compliments from people, and slowly he will realize that wearing a kilt is no big deal.

It's often been said that the dress makes the man, and I believe this to be especially true when kilted. Use the kilt to shape your life, and mold you into what your parents want you to be; a gentleman. This is something that you should take an interest in as well. I recommend buying a book on the subject. If the outfit doesn't draw positive comments your behavior will. If your father sees what a gentleman you are becoming he might also start to realize that what you wear isn't too important.