Find out your child's normal size and order 2 sizes down for a perfect fit, if you want a little looser order 1 size down. Like other reviewers, I notice that the creases smooth out after washing, but I just toss it in the washer and dryer so this may be user error. My little girl was 11 years old, about 75-85 pounds, slim, I ordered a size 7 and it fit perfectly.
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