We bought a size smaller than my son's usual size based on the reviews and he runs a bit large. It's not a big deal, but if anyone is interested I'd be happy to post it there. I think maybe some people just received a product that wasn't cut correctly on the block and that's why they all have some kind of size difference. My son now comfortably wears the 4T if that helps. That's all. Bought this for indoor swimming lessons in winter to stay warm, but it is not. However, I know that he does his job outdoors in summer and because he doesn't keep you warm, he doesn't get too hot in long sleeves even in summer. breathe well
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