Polina Sokhranova, Deputy Editor-in-Chief Interview Russia, after Haider Ackermann, Paris, September 2013. Thanks @Anna for letting me know Polina's name!
A lovely way to wear a slip skirt (or even a slip dress) during the day: pair it with a simple sweater.
Recreate her look (kind of):
Burgundy sweater: Jil Sander cashmere turtleneck sweater,  Iris &Ink cashmere turtleneck sweater, Topshop cashmere v neck jumper, Rag & Bone Natalie sweater
Donna Karan New York Bias skirt, Vionnet dipped-hem crepe skirt, Topshop Forest Green slip skirt, or Jason Wu bias-cut skirt