Okay, my first 2 pairs of these ultra high waist leggings I listened to sage advice here and got them in size S. [I have been wearing a lot of XS lately]. Fit fine, but felt they bagged a little at the knees after a year of wear. Feeling pretty good about myself and because it was a sale I bought another pair in XS. So now I don't feel quite so 'tiny' hahahah....had to make an effort to pull the waist over my 34" hips and do a bit of wiggling. I've exercised in them twice now and they feel fine, snug but comfortable. However, I do not pull these ones up quite as high as the larger size do to slight camel toe effect. Just motivates me to loose a little. I figure I am probably at a between size between XS and S. Recommend as others - go up a size. Terrific quality.