I ordered a medium but could have gotten away with a small as these do have some stretch. Very comfortable, not too sheer, perfect length, and I love that they are mid-rise. Highly recommend! For reference I'm 5'6" and weight 135 lbs.
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
Rated 5 out of 5