“I bought this for my 13yo son who is 6’. The AI recommended a semi tall medium or large. He’s growing like a weed and likes clothes loose so I went up a size to a tall XL. It just fits him. This shirt is very well made and the fabric is good but the sizing runs small and slim. If my son grows more there is only 1 more size above what he’s wearing. I would like to see more sizes and colours.”