Heuchera 'Prom Dress'. This new member of the DRESSED UP Series has large, ruffled, pewter leaves with charcoal veins. I've been happy with the other two members of this series, 'Ball Gown' Sherri Hill 55799 One Shoulder Tiered Prom Dress Couture Candy Dressed Up 'Evening Gown' Coral Bells Perennials New this year! Dressed Up 'Prom Dress' is the newest member of our collection of large, heavily ruffled coral bells whose size and unique texture makes them easy to pick out