I bought according to the chart of measurements, but even after sizing down, the small was still too big. Like, "gaping around the waist and falling down around my hips" big. I'm hoping it shrinks when I wash them, but I don't think it will ever look like the picture, so the whole idea of being sleek in lines is moot. FWIW, my measurements were exactly the same as the recommendations for a medium. A drawstring here actually would be a good investment, and at this price point, I think the other reviewer's idea to just make your own is not bad. Other than that, I love them-- comfortable, warm, great for lounging around the house.