One night last September, an event took place during Milan Fashion Week that reverberated far beyond the catwalks. It was the finale of the Versace show, a tribute by the creative director Donatella Versace to the work of her murdered brother, Gianni, the founder of the house, and it involved five of his favorite models of the early 1990s — Claudia Schiffer, Naomi Campbell, Carla Bruni Sarkozy, Helena Christensen and Cindy Crawford — posed in a tableau from yesteryear, and then in full runway strut. People in the audience clutched their cellphones in an ecstasy of frenetic posting.

“Versace just won Fashion Month in its entirety,” HuffPost crowed, calling it an “epic reunion.”

It was “iconic,” The Fader wrote.

It was the definition of a fashion moment, and it isn’t over yet.

In late October, it inspired a variety of group Halloween costumes.