I love this blazer so much i bought it in both colors. i'm 5'7", 120 pounds and bought the size 4 which is perfect. initially when i tried it on in the store i thought i needed the 6 because it was a little tight in the arms and shoulders. the 6 was too boxy on me and i'm so glad i went with the 4. it stretched, especially the arms, and fits perfect. i love how i can dress this down (with a graphic tee and jeans) or dress up (with a blouse and cropped black pants).