My 10 year old is slim/medium and about 142cm tall and I ordered XXL for him and it fit well although the shirt shoulders were a bit wide. But he really likes this shirt, it fits perfectly and is washable. If you order this shirt, you should pay attention to the size chart and NOT just order the "normal size" of your child. My child usually wears a medium or large shirt, depending on the brand. But according to this size chart it was XXL.
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