I needed the shirt a week before my sister's luau party and it arrived very quickly! It's a lightweight, flowy material that's thin but not too thin to require a tank top. My son is a very slim 9 year old wearing a boy size 8. When the only size available was 7/8 I figured if it was too small I would just return it. As a result, he landed on it a little loosely. Because it was a hot summer day in California, I didn't want to wear a tank top, so he just wore it like that. It had a slightly fitted fit so it didn't look bad. I would say the shirt size was closer to an 8 than a 7. My son is very thin. So if your little one isn't like that, you might need one size up because it's really tight. Otherwise, I highly recommend this shirt (I have the one with the pineapple and sunglasses), he loves it!
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