Fit: Open-back design with built-in mini shorts. I highly recommend wearing it with fashion tape. let me know if you need some, and I’ll include it with your rental. Size UK4 / US XS Details: Blair Waldorf-inspired dress based on a Vera Wang design, featuring silky satin and a silver sequin belt. Color Deep plum. Occasion: Perfect for cocktail parties, girls’ nights out, date nights, or whenever you want to feel like Blair.