I ordered a size small (7/8) for my slim 8.5 year old girl and they fit her perfectly. Although there is definitely nowhere to grow. I've always wondered why companies go from 8/7 to 12/10, but what about 9-year-olds? They also need pants. Definitely use your judgment, I'm pretty sure the medium will fall off her waist as they aren't adjustable. Although the quality is wonderful and they are very cute on her. I want something for me!
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