Mermaid Formal Dresses & Windsor Long Mermaid Prom Dresses & Windsor Mermaid Formal Dresses & Windsor Long Mermaid Dresses & Windsor. This stunning formal gown features a flattering mermaid silhouette in sumptuous velvet, available in rich emerald or classic black. The refined V neckline pairs beautifully with an intricate lace up back cutout, while sequin and beading details elevate the design with understated opulence. A graceful sweep train completes this sleeveless masterpiece, perfect for unforgettable evening events. Details: Silhouette: Mermaid Style Fabric: Velvet Fabric Color: Emerald, Black Color Length: Sweep Train Neckline: V Neck Sleeves: Sleeveless Back: Lace Up Back Embellishment: Sequins, Beadings