Although Giorgio Armani's fashion house officially came to life in 1975 - cofounded with Sergio Galeotti - 1978 also marked a pivotal moment. That year, a celebrity wore one of the designer's creations on the red carpet for the first-time ever: Diane Keaton donned a blazer and coordinating skirt for the star-studded Academy Awards where she won the Oscar for Best Actress for her role in Annie Hall.