I received this Kid Nation 2-Pack Long Sleeve V-Neck Shirt in Gray in a size Large (8-10). It fits my 8.75 year old daughter fairly loosely (see attached photos). I'm fine with that as she has room to grow into it or he could put a layer with a reservoir underneath. For reference, she is 52 inches tall. It's 100% cotton, so it's very soft and comfortable. Light and pleasant on the skin. It appears to be well made and of good quality.
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