My daughter usually wears a medium or 7/8 comfortably, she is 6 and tall. I ordered this in size 7/8 and it was a bit tight at first. I also ordered the next size up and it was perfect. I didn't wash it, so I don't know if it will decrease at all. I like the fabric, it's very breathable. I have also ordered french toast shaped shirts and they are much warmer, the fabric is less breathable which is not bad but for warmer months I would say they are better. I advise you to take one size larger, in general I am satisfied.
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