Celebrity Angelina Jolie Perfects the Art of Power Dressing in a Sheer Black Dress for Her UN Speech By Olivia Bahou Olivia Bahou Facebook Olivia Solomon is a New York-based writer and editor who covers all things fashion, lifestyle, celebrity, and pop culture. She was previously the Assistant Digital Editor for InStyle, and her work has appeared in many national publications. InStyle's editorial guidelines Updated on September 8, 2016 @ 01:30PM Pin Share Tweet Email Photo: Stefan Rousseau/WPA Pool As we begin the sartorially tricky transition from summer into fall, let Angelina Jolie guide you with this effortlessly chic LBD. The mom-of-six and tireless peace activist attended a UN conference in London on Thursday in the perfect power dress. Jolie stunned in the knee-length frock, which featured a sheer neckline and sleeves and a peplum waist. The star kept her accessories simple, adding just diamond studs and nude stilettos, and pulling her long brown hair back into a coiffed bun. Stefan Rousseau/WPA Pool The United Nations Special Envoy was a guest at the UN Peacekeeping Defense Ministerial, where she took the stage to discuss the importance of appointing female peacekeepers to prevent sexual violence throughout the globe. In her speech, she praised the servicemen working to make the world a safe place. “I pay tribute to the men and women who serve … for their commitment and their sacrifices,” she said in her address. Angelina Jolie Looks Seriously Angelic During a Trip to the Mall with Her Kids VIDEO: A Decade of Angelina Jolie's Red-Carpet Looks This empowering star has both brains and beauty.