I'll add that most everyone seems to add some of their own flair to whatever they're wearing. Even if it's jeans, there's something special about it all. Extra bling, fab sunglasses, big necklace, rocking shoes, whatever.
Lately, I have not seen much in the way of black tie on a Sat. night with the exception of the judges and some of the people sponsoring events. It seems even Black Tie has gotten more relaxed.
I never wear dance shoes to watch events. I just never dance at these things and I don't find them comfortable to stand in for hours at a time.