Their fabulousness was met in equal parts by the casual '70s crew: Ali MacGraw, Diane Keaton, Jane Birkin, and company repped the kind of '70s style that feels more like brunch in NYC rather than wild nights at Studio 54. If I'm trying things on at Balenciaga and I know that I'm going to wear it with my big pleated Stella Pant or my big Liam Blazer and it's going to work together, now I know...