My 12 year old is 5ft 7in and weighs 125lbs and I bought a free size 14-15 for him. They would be perfect if it wasn't for the embroidery. He didn't like the way they rubbed his ankle and one of the pockets wasn't sewn on properly so he couldn't put his hand in it. Otherwise they seem fine. He just tried them on over a pair of fleece pants, hopefully that gives you an idea of how loose they are.
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