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Celebrities love Mary Katrantzou! The Greek-born, London-based designer launched her first ready-to-wear collection in 2008, and her instantly identifiable vibrant prints became a red carpet favorite ever since. “It’s flattering,” the designer told InStyle.com of seeing stars like Keira Knightley, Hailee Steinfeld, Claudia Schiffer, and Dianna Agron in her designs at the British Fashion Council’s London Show Rooms event in Los Angeles. “It makes you happy because you never have that perspective until you see the clothes on a woman. It’s always been a woman with a strong presence. It’s amazing.” Last month, her skills were recognized in a big way when the 28-year-old won the Emerging Talent Award at British Fashion Awards. Her clothes are available now at net-a-porter.com, and next year she’ll be releasing collaborations with Topshop and Longchamp. Not ready for her print power? Heed her advice: “You have to have a little bit of fun—especially with prints. We all need a little bit of color and humor in our lives. Wear it confidently.” See who else loves wearing Mary Katrantzou’s designs in the gallery.

— Sharon Clott, with reporting by Lindzi Scharf

Stars like Hailee Steinfeld, Felicity Jones, Stacy Keibler, and Beyonce are embracing braids for fall and experimenting with a range of creative styles. “I was going to do a [braided] headband, but then I thought, ‘I have the hair to do it without the headband,’” Steinfeld told InStyle.com of the small hairline plait she wore to a Chanel dinner in Los Angeles last night. “I haven’t done anything like this before—I love it!” Meanwhile, hairstylist Marcus Francis gave Like Crazy star Felicity Jones a roughed-up, fishtail braid earlier this week. “I loosened the braid by gently pulling apart each side to widen it and bring out the flyaways,” he told us. “It helps to soften a structured look.” A cascading braid like Keibler’s is ideal for formal events, while a simple side braid like Beyonce’s is always classic and ultra easy. For more of the most memorable hairstyles of the year, click through the gallery! 

MORE:
• Try on Braids in Our Hollywood Makeover Tool
• How to Do a Fishtail Braid
• The Hottest Fall Hair Colors
• Fall’s Most Popular Haircut

— Hannah Morrill, with reporting by Kwala Mandel