In all matters, stick to black...I lived through that awful period from the late sixties through the early seventies when men's formal wear went from tasteful and understated to a rainbow of very unfortunate colors. If you don't believe me, find some Playboy magazines from the period and look at the fashion articles and adverts. I'm afraid that even dark blue (navy or midnight) would still be right out for me.

The kilt has enough color in it already....accessories should not compete with it.

Keep it simple.

Best

AA