I bought a 7-8 for my soon to be 6 year old. I didn't want her to be too big for her breasts to be seen from the side. Tanks hug the body, so her chest is completely covered even with 7-8, however, very tight and tight. I don't think they will fit her again next summer so I'll try 9-10. I hope they don't look ridiculous on her for too long. The fabric is soft and feels comfortable.
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