Jacket material is nice but runs small. Order in a bigger size.

My 9 y/o son wears a size 10. Height wise he is not the size of a average 9 y/o boy but he is close. Athletic built. A size 8 is too small for him and a size nine fits just right. Buying a size 10 I thought I would give him room to wear sweaters underneath…….. NOT AT ALL. A size 10 is literally like a Size 8 on my son. This jacket is soooooo small. Definitely sending this back. I would have to by a size 12-13 just for it to fit my son.