In Dark Waters (2019), the clerk leaves an envelope for Rob and says:
Your tickets to the Chemical Alliance dinner. And no, dark suit is not the same as black tie.
What does he mean with that?
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Black tie is a very specific look, a formal designation alternatively known as a DJ [dinner jacket] in the UK & a tuxedo in the US.
An ordinary dark suit is simply not an adequate substitute.
I haven't seen the movie, but from just that quote I would guess the clerk assumes Rob isn't sufficiently au fait with the subtleties of society dress-codes to know this. It feels like he is being snobbish.