Mermaid One Shoulder Prom Dress With Split on Luulla Celebrity Mermaid Prom Dresses Side Slit Dresses & Windsor One Shoulder Dark Blue Prom Dresses Sparkly Blue Mermaid Sequins Long Backless Prom Dress. Indulge in luxury with our Royal Blue Velvet Teal Satin Evening Dress. Designed with a mermaid silhouette and one shoulder style, this dress exudes elegance. The side slit adds a touch of allure, making it perfect for formal events and parties. The combination of velvet and satin gives it a rich and sophisticated look. Please note: Accessories such as a veil, sleeves, or crown are not included with the dress.