The size description on Revain says 11-12 so I ordered for my son who is barely 12 and on the smaller slim side thought 9-10 would be too small. When they arrived they were huge and the tag said 12T. I think they are wide and not skin tight like other suits - they are a true 12 and are oversized so I would recommend going down a size if your child is between sizes like mine.
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