I thought I needed 3x and tall based on other brand of yoga pants. They were really long and big. Went to our local Reitmans and exchanged the pair to XXL regular and they were perfect. The tall was bunching up a lot at my feet and the regular sat perfectly on my shoes. I am 5'9". The quality of the pants are fantastic. They don't over stretch to show the underwear. Really liked them, bought a couple of pairs.