A regular at all of New York's fashion shows, Cunningham always wore the same "uniform"—a blue jacket and khaki pants—and photographed both the famous and the unknown.
"I realized that you didn’t know anything unless you photographed the shows and the street, to see how people interpreted what designers hoped they would buy," Cunningham once wrote. "I realized that the street was the missing ingredient."
His work, which spans more than 40 years, forms an anthropological study of our society's fashion—one that will be remembered for years to come.
Here is a gallery of Cunningham at work.