Nor does it hurt that the reigning pop stars of the day shopped at Biba , a gilded cohort that included Brigitte Bardot ; Mick Jagger and Marianne Faithfull ; Sonny and Cher ; Julie Christie , who wore a Biba wardrobe in '' Darling , '' John Schlesinger 's cautionary 60 's film about the London style set ; and , not least , Anita Pallenberg , the honey-skinned consort to Keith Richards .