Shop for Princess Ariel costumes from The Little Mermaid! We carry a large selection in variety of sizes from babies to adults. You'll transform into a magical mermaid princess! Enjoy an undersea adventure with an Ariel sparkle dress, Little Mermaid tutu, or classic shimmer gown. And if you want to play the villain, we carry Ursula costumes, too! Little Mermaid costumes are perfect for costume parties and playtime fun all year long.