I Tested the Stunning Princess Tiana Blue Dress Costume Heres Why It Tiana B. Dresses Tiana B Blue And Black Mini Dress Poshmark Princess Tiana Blue Dress Costume Princess Tiana Blue Dress Costume. Get ready to be the life of the party in our Tiana Dress! This playful mini dress features thick shoulder straps, a round neckline, and a bodycon fit for a flattering look. The rhinestone detailing adds a touch of sparkle, making it the perfect choice for your next New Year's Eve celebration. Complete the look with a pair of white heels and a matching bag! FABRICATION: 955 Nylon 5% Elastane SIZING: Holly's height is 156cm 5'1 and wears a size AU 6 US 2.