How Princess Diana and Gianni Versace made fashion history

The guest list for Gianni Versace’s funeral in Milan, 1997, was a testament to the designer’s monumental impact on the world of fashion. Carolyn Bessette-Kennedy, Naomi Campbell, Giorgio Armani, and Carla Bruni all made a pilgrimage to Milan to pay their respects to their friend and collaborator, who had been gunned down by a serial killer outside his mansion in Miami.

But among the thousands of…