From my observation of your reference. These are the keypoints of the crease
It suggest tight at the waist to thigh area, and a small flare towards the knee.
thin, deep and straight - more for tight fit, at the waist area.
wide, shallow and straight down due to gravity - flaring outward, at thigh to knee area.

Look back at your dress.
waist area - wide, deep and curvy. Especially when it goes horizontal, it is suggesting a loooooose hang on the waist.
By the way, the shape of the thigh to knee, is rather fitting, can't see the flare.