Strapless Long Blue Mermaid Prom Dress 4720BNSparkle under the lights in this strapless long blue mermaid prom dress 4720BN from Blondie Nites. Crafted in eye catching shimmer fabric from the uniquely modern sweetheart neckline to the horsehair hem, this long blue formal dress is delightfully vibrant for prom, galas, and other black tie events. Offered in junior sizes, this strapless long blue evening gown has a long mermaid skirt that hugs the hips before angling away from the knees to the