Sexy Mermaid Costumes for Women -- Show off your tail at your next party with a sexy mermaid costume! Dress up in a Sultry Sea Siren costume, Mesmerizing Mermaid costume, or sexy Princess of the Sea costume. Don't forget important accessories like our mermaid wigs, and popular Seashell Bra. With a sexy mermaid costume, you'll be the only fish in the sea! Great for parties year round... not just for Halloween!