Disney's The Little Mermaid: Toddler Sized Classic Princess Ariel Costume Includes Dress with Character Cameo. Make any day a magical one for your little one with this adorable costume! Perfect for dress up, parties, and fancy occasions, you'll have their back when it comes to making memories with their favorite princess! They'll be ready to save the day in a sparkly, swishy statement dress! Perfect for trips to the beach, birthday parties, or just spinning around in the living room, they'll be feeling like a real under-the-sea royalty.