- Heighten your visual appeal in this lovely Mac Duggal 66029M long gown. Floral print, strapless, sweetheart neckline, open back, pleated mermaid prom dress with beaded belt. This Mac Duggal design is sure to make a statement in that special occasion. Style: macduggal_66029 Details: Strapless, Beaded Belt, Floral Print, Pleated, Mid Open Back, Back Zipper Length: Long Neckline: Sweetheart Waistline: Natural Silhouette: Mermaid