My daughter loves this skirt. I was on the fence about sizes; she wears pants size 6 (but they run small), she is 4.5 years old, 45 lbs. I ordered 6-6X and 5, 6-6X came first and fits perfectly. She has a 22 inch waist with a skirt (thought that would be more helpful than "she is thin/medium"). She seems comfortable in this skirt and walks as I expected. Good quality for the price!
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