Got this for my 3 year old son. He's tall and skinny and I usually buy him a 4T in other clothes that are slightly larger on him to get through the winter. It was a 4T and it just fitted so I'd recommend going up a size as it's a windbreaker material and doesn't stretch! It still fits and he loves it for the not too cold and rainy days! He calls it his basketball jacket lol
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