Start by tracing front and back separate.
Adjust length to 10cm above knee, then flare 10 to 14cm from sides. Blend to zero at waist.
Drop 6 to 8cm from nape point in center back and square across 10cm to draw the new neckline. Draw a line from this point to hemline 5 to 7cm away from center.
On front, drop 2 to 4cm from neckline and repeat the same (square across and draw the line all the way to hem).