Costume Child Mermaid Party Time Online Mermaid Costume for Girls, Toddler Sequin Dress With Matching Mermaid Children Mermaid Dress Costume Girls Mermaid Cosplay Dress Halloween Fancy Dress Up Costumes Kids Amazon.com: Kids Sparkling Mermaid Costume Girls Costume Dress with. This adorable mermaid costume for girls is perfect for dress up parties, Halloween, or themed events. The outfit features a vibrant metallic blue bodice with a shiny purple seashell inspired top, complete with soft tulle shoulder accents. The skirt mimics mermaid scales with sparkling teal sequins and has a beautiful, flared purple tulle fin at the bottom, giving it an authentic mermaid tail look. The dress is designed for comfort and elegance, making it easy for kids to move and play while feeling like an enchanting sea princess. Pair it with some glittery shoes, and your little one will be ready to make a splash!