The British fashion set gathered in Londonto celebrate one of the country's most renowned designers, Mary Quant,at the premiere of the first official documentary on her life and career.The movie tracks Quant's rise from a fashion-conscious tomboy growing up in the Welsh countryside to the daring avant-garde designer often credited with the invention of the mini skirt.The film uses archive footage, enactments and interviews with model Kate Moss, British Vogue editor Edward Enninful and Quant's designer godson Jasper Conran, among others.Actor, producer and former fashion designer Sadie Frost made her feature film directorial debut.DIRECTOR, SADIE FROST, SAYING:"You know, she just did so much for women and kind of empowerment and, you know, the whole kind of sexual liberation. You know, women couldn't even run before she invented her clothes. And then once, you know, women kind of started wearing mini skirts and all started running around and having a great old time. So, you know, she changed the way women were in society, I feel."With Quant's role in revolutionizing womenswear at its heart, the documentary takes viewers back to the swinging sixties and the thrill of the British Invasion, the cultural movement of the mid-1960s that included The Beatles and The Rolling Stones.Quant, who turns 92 next February and is rarely seen in public, did not participate in the documentary but the film was made with the blessing of her son Orlando Plunket Greene, who is featured.Guests on the red carpet paid tribute to Quant's enduring influence -including fashion designer Zandra Rhodes.FASHION DESIGNER, ZANDRA RHODES, ON MARY QUANT, SAYING:"Well, her legacy is the beginning of swinging London, you know, the real swinging London and how we remember it. And I'm one of the few people that knew her."