About this non matching socks and white square plus white shirt discussion.
What do you wear on the evening, Foo? This is a black and white photograph, but I believe that you're donning a white shirt with a white square.
Warning: Spoiler! (Click to show)
The square is cream silk, not white. Socks are black silk with a woven diamond pattern, but my dinner suit is midnight blue, not black.
That said, I have no qualms about white squares or black socks worn in a black tie ensemble. The outfit fundamentally relies on binary contrast.