I bought size 6-7 for 5 years (medium size for her age) and 7 years (small for her age). Then it suits both of them. More like stretchy spandex material. Great dress to turn in. Super sweet!
Pros
π FEATURES: Short sleeve girls dress, simple and stylish casual style, short sleeves, round neck, knee length, swinging and twist hemline. Stylish, bright color and comfortable. Your girls will love the softness of this casual dress and the way it wraps around. Such a cute dress! Simple, comfortable but beautiful for your little one.