"This t-shirt is not a fitted t-shirt, so the sizing tends to run a little large in my opinion. My daughter usually wears a 6x-7, so we purchased the size 7 (fearful the 5/6 would be too small) and it is large in the arms and around the stomach on her. We are keeping it and have tried to shrink it a little (100% cotton), but I think it just seems to run large."