Elegant Mermaid Sweetheart Neck Puff Sleeve Open Back Navy Satin Floor Length Mother of the Bride Dresses Missord Sweetheart Neck Puff Sleeve Sequin Formal Dress Sequin formal Long Elegant Mother of the Bride Dresses Beads Satin Floor Length A Simple A Line Dark Blue Satin Long Prom Dress, Dark Blue Long Formal Mermaid Wedding Dresses With Bling And Lace Tea Length Sage Green Mother Bride Dresses Elegant Dress Mother Bride. This elegant mother of the bride dress features navy satin (with ruched detailing & thigh high slit): it has a sweetheart neckline, puff sleeves, mermaid silhouette, open back, and a sweeping floor length train hem. The modern, sophisticated style is perfect for formal weddings, evening galas, or upscale events.