Magical Mermaid Costume Size Our little girls' mermaid costume includes a sequin trimmed gown with organza fin and shell bodice. This beautiful mermaid costume for kids also includes a pair of ruffle arm bands and a shell headpiece This girls mermaid costume comes in child sizes X-Small, Small, Large, Medium. Wear this children's mermaid costume for Halloween or as a magical siren of the sea for imaginative pretend play dress up. Please note: This item's color may vary due to inherent manufacturing variations or your computer monitor's color settings. The item you receive will be identical or substantially similar to the item pictured in this listing.