Adult Dark Mermaid Siren Costume Spirithalloween.com Amazon.com: Spirit Halloween Adult Ariel Costume The Little Mermaid, Women, Size ADULT SMALL, Multicolor : Clothing, Shoes & Jewelry Deluxe Mermaid Costume 4 Piece Complete Set! XXS 12 18 Months Amazon.com: Spirit Halloween Adult Ariel Costume The Little Mermaid, Women, Size ADULT SMALL, Multicolor : Clothing, Shoes & Jewelry While everyone else is getting into the spooky spirit of Halloween, my daughter is swimming against the tide (pun intended!) and rocking a beautiful mermaid costume! Thank you @mermaids_of_arabia for this 25 Mermaid Halloween Costumes For The Whole Family