I think the size is equivalent to a Medium. I'm 155cm and 45kg, and it's a bit of a question mark - will it fit just right, or be a little loose? The set also includes the headband and apron shown in the first two photos! In the third and fourth photos, it fit perfectly on someone who is 158cm and 47kg! The cat ears are not included! I only wore it twice for Purikura (photo booth) during Halloween!