We all get dressed for Bill, says Vogue editrix Anna Wintour. The Bill in question is 80+ New York Times photographer Bill Cunningham. For decades, this Schwinn-riding cultural anthropologist has been obsessively and inventively chronicling fashion trends and high society charity sorties for the Times Style section in his columns on the Street and Evening Hours. Documenting uptown fixtures (Wintour, Tom Wolfe, Brooke Astor, David Rockefeller who all appear in the film out of their love for Bill)