In the early 1940s, American film actress Veronica Lake changed her trademark peekaboo hairstyle to encourage women working in war industry factories to adopt more practical, safer hairstyles. Veronica Lake was a popular American film actress who enjoyed both popular and critical acclaim, especially for her femme fatale roles in film noir with Alan Ladd during the 1940s. A stray lock of her shoulder-length blonde hair during a publicity photo shoot led to her iconic hairstyle which hid one eye, and was widely imitate. (via)