It has been 20 years since Sex & the City first aired and this has been the absolute talk of the town lately. I will leave it to other, more qualified writers to espouse what we learned from this series and what it meant about our social norms. When it comes to fashion however, I will happily discuss one thing it ingrained in our collective psyche that I still have not forgotten: evening wear for daytime. Let’s backtrack a moment and remember who costumed the fabulous foursome: Patricia Field. A visionary in how she costumed both tv shows and movies, Pat taught us so much about how a women…