Hmmm...I just went and read a BUNCH of reviews of this skirt (mostly glowing) on the Patagonia site, and sounds like the XS would be fine for me. One reviewer who said the Small fit her well wore a size 6 normally, and most who mentioned their weight and fitting the small weighed 120+. The gals who fit the XS weighed from 110-115, and I weigh around 105. My hips are small (34.5"), but my waist is not nearly as small as the size chart. Still, from the reviews, people said it was very stretchy and there was no need to size up. Still a bit scared but will probably go with the XS. And cross fingers and toes!