I am usually anywhere from an x-small to a medium depending on the article of clothing. I decided to go with the XS/S and I'm not too disappointed. The material is a little thinner than I wanted it to be, not exactly the best for bone-chilling winter days, but it is perfect for the fall. The color is a little more of a blacker color than the photo but is very pretty. The sleeves are also a little on the short size (probably because of it being an XS/S) but looks cute when rolled up. Overall, I would give it a 3/5. It was an inexpensive price and is a good staple item.