It did not matter for the blog post so I left it, but it is one of the few occasions where AWB has got it way wrong
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For court dress, funerals, memorials and civic dress (formal ceremonies at Livery Companies, for example), the waistcoat must also be black to match the coat and a grey morning suit is not permissible
Ensure they complement the formal nature of your outfit, coordinating with your tuxedo or formal black suit
The traditional bow tie is black, but other color variations are acceptable these days
Size: US2-US26W / Custom size