black tie, white tie

[davedove]

Also, after going over wiki's idea of highland blakc tie and white tie they mention a white waistcoat for white tie and a black one for black (makes sense). But would it be also acceptable to wear a tartan waistcoat for either?

I would think that if you were following the strict dress code, you probably shouldn't, especially for white tie. Under the guidelines I have seen, that would probably fall under "festive black tie."

Of course, nowadays, not a lot of events follow the strict guidelines.