I don't know why it says size 6 when a size 5 would be more accurate. Even the inside of the dress says size 5-6. So I'd say it's true to size, but they really should label it differently. In any case, the dress is baggy and maybe a little short, but going up a size doesn't help because it becomes too baggy. I appreciate that it is cotton and will make a lovely nightgown for my daughter. I don't like that all nightgowns at the Disney store are polyester so this was a good find.
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