Quote Originally Posted by Jack Daw View Post
Well, I have seen a gentleman wear a white tie, a white waistcoat, and a black PC. Is this not a white tie outfit in which a fly plaid could be included?
Sorry,old chap,a PC and white tie and white waistcoat should not be seen together,just won't do!

If you want to wear a fly plaid then just wear it,but it is wise to know the "conventions" that you are "infringing" before you do.