412girl, Pittsburgh, PA
Purchased this for my son who wanted to be a ref for Halloween, like his dad. He was so excited when it came in...perfect. We initially ordered the small. My son is 6 and it did fit, but I wanted it a bit looser for Halloween. To me, a S in this shirt is more like a child's XS in a cotton t-shirt. We ordered a M instead, which has the same measurements as a child S cotton t-shirt.