I notice that most x-smalls say a 24 inch waist, which I most definitely do not have, even though that is the size I wear in most brands. However, something inside my brain is saying that Patagonia runs really small. I can't wear x small Ibex bottoms, even though the tops fit me perfectly in that size. The time I went to the Arcadian Shop in Lenox for their big sale with Lisa and Deb, I almost got stuck in a pair of Ibex ski pants because i tried on the x smalls .