Step 2: track the motion.
Clothes flow over the body like water. The folds on clothes are
determined by kinetic force and gravity.
Poly is twisting at the waistline and the part of her shirt thats
tucked in is pinned in place but her chest and shoulders have
rotated to the left (our left) and pulled the fabric along with
them. What results are sweeping lines from the shoulders to the
Her right leg is forward which pulls the fabric tight over her
upper leg and creates a fabric flow in the direction of motion.
Let's see how this works.