I attend, usually in a working capacity, several events each year that would most probably be considered in the "Black Tie Optional" category. I have worn a kilt to some of them with a conventional necktie. I do own a wing collar shirt and black bow tie, made for me for my wedding so many years ago, but haven't even tried them on lately.

I haven't chosen to own a conventional dress kit as most customers are happy with a coat and tie from technical types. I have selected a few events to wear the kilt to and have had overwhelmingly positive comments.

Bob