Lucy Boynton, the actress and Chanel ambassador, explains why costumes are a significant part of her acting process, especially with films set in a specific time period. Dressing up in corsets, wigs and big dresses has also impacted her personal sense of style, she says. In her latest movie, "Chevalier," Boyton plays Marie Antoinette. "She wanted to make sure that she was a coauthor in people's perception of her, so that is very much informed by the way that she presented herself," Boyton said.