I first ordered XS for my 6 year old who wears a size 8 and S for my 9 year old who wears a size 10/12. When I received them, XS and S were almost the same size. The Small was slightly wider than the XS, but it looked like a tailoring error. it was very short, almost to mid-waist. :-). I thought it was just a cutting error so I asked for a refund. The seller was great! They refunded my money and told me not to return the defective product. Instead I bought a medium with the refunded money and gave it to my son who is a size 10/12 and the small one to my son who is a size 8. Fits great, shrinks a bit after washing. Would buy again if I hadn't gotten the belly version. ;-P
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