So my son is 5 and wears 5T most of the time, but I buy him a size 6 underwear. I accidentally ordered XS, size 4/5 instead of S, but they still fit him surprisingly well. They are more fitted but still comfortable and not tight. The belt fits well but doesn't dig into his skin and it's nice and soft. It feels cool like a dad with a Calvin Klein belt. Overall we really like them but we probably won't order again unless there's a sale.
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