Size:Toddler Fiber optic lights twinkle for a short time when a button in the skirt is pushed. Costumes are sized differently than clothing, be sure to review Rubie’s size chart before making a decision and if your child is at the top of the range, consider buying a size larger. Rubies brings fun and fantasy with quality costumes and costume accessories, offers the broadest selection of products, and to promotes safety in dress-up.