Only tried on. With tags. It's a free size, but I think it would fit someone who usually wears S to M sizes, like the model. - Quoted below - A compact knit top made with elegant, strong-twisted yarn that has a dry touch and a light, crisp feel. The slightly longer ribbed hem firmly cinches the waist, creating a flattering silhouette. It's easy to wear daily and goes with any bottoms. No sheerness, stretchy.