Bought two of these dresses for flower girls! My youngest is a size 6 and she fits in the size 8, but its long on her and will need hemmed. My oldest wears a 7/8 and the 8 fit her perfectly w/o needing to be hemmed. I did order the next size up for my oldest, but it hasn't arrived yet. Im guessing it will fit her the same the smaller one fits her sister!!