I ordered it under my daughter's dress. Based on other reviews of the shirt running small, I ordered a size larger than usual. My daughter is 5.5 years old and I bought her a small one (it says 6/6x on the t-shirt). The shirt is too big, the sleeves cover her arms which leads me to believe this shirt fits like it should. But that's okay, I'll save that for later. I have reordered another color in XS which I think will fit now. The shirt feels long in both the sleeves and the body, which I like. The fabric is a bit see through (at least on the white shirt I ordered) so I would only use it for layering. Seems to be of good quality, especially considering the price.
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