Birthday Mouse Costumes Polka Tutu Year Number Top & Headband (Small-Age 2) Red-White Polka Dots Tutu with Black Ruffle Trim 2 Layers Tutu. Year Number Black Tank Top with Red/White Polka Dots Headband. 3 Pieces set included 1. Tutu 2. Tank Top 3. Headband. Perfect costumes for Birthday, Dances, Parties, School Events, Performance and Any Special Occasions. Small: 8'' Skirt Length, Waist size: 16"-24". Year 1-2. Medium: 10'' Skirt Length, Waist size 20"-26". Year 3-5.