Although I have the opposite problem than most people report here, one thing is clear: these leggings do not fit well. I am 5'8", 112 lbs and usually wear a size zero. Based on what others have reported, I ordered the S/M, since I knew that the M/L waist would be way too big on me. Well, the waist, hips, and thighs on the S/M are a tad too big, while the length is more capri on me. In a nut shell, do not order these leggings if you are tall and thin. Perhaps there is gross inconsistency in the manufacturing? Either way, consider another brand of leggings before you order these.