Francesco Risso will become creative director of the label.
The designer had most recently been freelancing after running his own label and working at Cerruti and Jack Wills.
Guests included Yaz Hernandez, Alexandra Kotur, FIT’s Joyce Brown and Valerie Steele, and this year’s cochairs Julie Macklowe and Elizabeth Musmanno.
The Italian designer’s first collection will bow in September for the spring 2015 season.
She succeeds Christopher T. Metz, who has resigned. In addition, Jason Neimark resigned from the board.
InStyle’s Hal Rubenstein will host the Nov. 3 ceremony, which also marks the council’s 20th anniversary.
For the project’s ninth installment, the retailer has partnered with the brand for three limited-edition canvas totes.
On Saturday the brand installed an outdoor exhibit in Malibu, Calif., by two-time world champion surfer and photographer, Daize Shayne Goodwin.