I ordered a medium, and they sent a large. I'm glad though it fits perfect! I am 5'5" and 120lbs. Very cute really really soft too. I trimmed some long strings but other than that very nice for the price.
I absolutely love love love this sweatshirt! I'm about 5'9 and weigh somewhere around 123lbs, size 34C, and usually wear a medium. I saw on other reviews the sleeves run short so I ordered an XL and it fits perfectly! I highly recommend this hoodie!