My son LOVES this set but they weren't kidding when they told me to order a size up. He is 7 so I order age 8-9. He was very slim though. I immediately ordered another one in the next size. This is a VERY FINE APPROACH. I think the age, not the size, is confusing. He wears a figure eight in his clothes, which seems to be the norm for his age. They didn't seem to be age appropriate. If your child is in the upper age group I would go for the sizes.
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