I order 10-12 on average and received 8 on average. However, the size chart says the average is 10-12. Luckily it's a "muscle shirt" so it's ok, it's a bit tight and he doesn't mind, but it's long so I'll have to order more later. He likes it so far so we kept him but I just wanted to clarify that the medium is definitely not a 10-12.
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