A soigné silhouette that exudes crepuscular glamour, the deep navy blue Lucienne gown from Rebecca Vallance is a must-have piece for the festive season. Crafted from the label's signature bonded crêpe, the mermaid silhouette starts at a strapless sweetheart neckline and ends at a fluted skirt, with golden insets at the sides contouring the waist and hips. Accessorize yours with jewels and a structured clutch for a magnetic evening look.