Elegant Satin Sweetheart Neckline Puff Sleeve Bridal Gown on Luulla Premium Lace Sweetheart Neck Gown in Powder Blue Royal Blue Sweetheart Neckline With Sequin Front Hi Depop Sweetheart Neckline Gown Neiman Marcus. Designed to turn heads. Cut to a sculpted, figure enhancing silhouette, the Lillienne dress is crafted from premium stretch lace and features a sweetheart neckline with underwired cups for elevated support. The fishtail hem creates a dramatic finish, while the scooped open back detail adds a refined touch. Fully lined for a smooth fit, this gown is designed to contour and flatter from every angle.