I would say this fits more like a size 6/7

This beautiful Gymboree girls' dress is perfect for any formal occasion. The dress is made of soft velvet and comes in a stunning teal blue color. It has a knee-length style and is a size 8. The dress is brand new and still has its tags attached, making it an EXCELLENT choice for a gift or personal use.

The dress is suitable for girls' department and is categorized under Clothing, Shoes & Accessories, Kids, Girls, and Girls' Clothing (Sizes 4 & Up), Dresses. The dress's fabric type is velvet, and its color is blue. The dress will make your girl look elegant in any setting, and it's perfect for family events, weddings, and other formal occasions.