Wonder Girl Big Girl's Lace & Lurex Hi-Low Dress Made in USA Braided Belt Variation. This popular style comes in two different belt options! Girls Ages 4 to 14. Hand wash with cold water. 100% Polyester * A Size 6 is for the Average 5 to 6 year old girl. A Size 8 is for the average 7 to 8 year old, etc. Using the Size Chart as a reference, a size up or down from there (if necessary) will get you to the right fit!