Review on 👕 Shop Now for Buyless Fashion Little Cotton Undershirt: Boys' Tops, Tees & Shirts! by Tyler Cooley

I bought each of my boys a set. I bought a 6 year old 6-7, an 8 year old 7-8 as they always run small. He's put on some weight so is a bit stockier and doesn't need a bigger size for his age. Tried 7-8 on it and it's tight. Worn by a 6 year old, fits perfectly. It's stretchy so it might fit an 8 year old but it was uncomfortable enough for him that it hadn't even been washed. I don't even want to see how much denser it can get after it's gone through the dryer. So you should increase the size.