I’m honestly speechless at the quality of this blazer ! It’s absolutely stunning. I wish I would have purchased the blue one also bc it’s just that amazing ... too bad my size sold out. Anyways. Definitely size up. I’m 100 pounds 5’1 feet tall. And I always order XS in tops, but it needed to be an inch bigger around the waist to close. I forced closed it and I can handle it but i can’t close it all the way down, only about half way. So I’ll have to wear high waisted pants with it. I would have bought a small, but it’s the first time I didn’t fit in an XS. It has metal on the waist area like a steel bone corset. It will have your waste looking snatched !