I bought size 4T for my son who usually wears 3T. It's definitely a loose fitting shirt but I'm planning on wearing a vest over it so it doesn't matter. It seems to wrinkle a little more easily, so I have to steam or dry it before we wear it. The photo of the shirt I shared has been hanging for days now and the creases have not been smoothed out. My son weighs 31 kilos.
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