I bought a size 16 for a girl almost 12 years old as she is tall and very slim but too long and wide - would have gone 12/14 must. Otherwise it's a great shirt. I also bought a size 16 Reebok Sunset Ombre Delta Dip Dye T-shirt which is great and fits great - difficult to find the right size. I would say it would fit a tall well built 12-13 year old.
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