EXCLUSIVE AT NET-A-PORTER. David Koma has dressed the likes of Beyoncé, Penelope Cruz and Kendall Jenner for red-carpet appearances, so we knew he'd be up to creating a few styles especially for us this party season. Made from flocked tulle embellished with light-catching crystals, this midi style is trimmed with black satin at the neckline, cuffs and hem. It's lined with a slip for coverage, too.