I wear a medium, and ordered a large because I like my dance sweaters large. I could not get my arms into the sleeves - halfway between my wrist and elbow, it seemed as if the fabric was about to tear. I could not get the sweater over my head; again, as I started to pull it over my shoulders, it felt as if the fabric would tear, and the edges are unfinished. The adult large seemed like a child size, except that the sleeves looked extremely long. Unless you are a size zero, and have little skinny stick-like arms, I would not order this product. I am disappointed; I really liked the feel of the fabric and the look of the sweater in the picture.
I have this sweater in 3 different colors, Raspberry, Grape, and Teal, and I love them all! I wear/wash them several times per week teaching and they are very durable. I am 5'5, 120 lbs and ordered a size small. It fits great.