"Oleg Cassini" was an American fashion designer born to an aristocratic Russian family with maternal Italian ancestry. He came to the United States as a young man after starting as a designer in Rome, and quickly got work with Paramount Pictures. Cassini established his reputation by designing for films.
He gained additional renown by designing for FLOTUS/First Lady Jacqueline Kennedy. "The Jackie Look" was highly influential in American design. Cassini's designs such as the A-line, Sheath dress/sheath and the empire strapless dresses continue to be influential. He was inspired by sports and Native American culture.More Oleg Cassini on Wikipedia.