Strapless Taffeta Crystal Twist Mermaid Gown Formal Prom Dress. Irridescent strapless taffeta dress with flared mermaid skirt, beautiful flattering crystal spray design, boned bodice, full length, crinoline petticoat, fully lined, matching satin scarf and optional spaghetti straps included, zip back. Prom, bridesmaid, graduation, evening gown, holiday or formal.