I got my regular size, Donna (L = 12-14), and it fits me the way it looks on the model. This is definitely not a tailored sweater, it is roomy all over, but it drapes beautifully, so doesn't look baggy. The longest part hits me about mid-thigh, the shortest part on the hip. The fabric is wonderfully soft and lightweight and the Purple Vintner a delicious shade of raspberry pink.
With this kind of sweater, I often wonder if people who comment on the store website that they are sizing down because the sweater is "big", are perhaps not used to a roomy all-over look and like to wear it more fitted than on the model. Hard to say, of course.
For me, going by the size chart body measurements, bust was most accurate, waist and hips will fit someone with slightly larger measurements too.
Sorry I can't measure the XS for you. But if you have free shipping and returns, perhaps you could order both? It's definitely worth a try!-)
