I am tall and big boned so I was leaning toward a large, but took a chance based on other reviews and went with the medium hoping they'd be tight in a sexy way. When i took them out of the bag i thought i should give them to my 12 year old niece to wear. But, reluctantly i tried them on and the other review i read was right-they stretched out and fit like leggings. They were tight, but no muffin top and they look like pants. I love these and am definitely getting more.