Step 1
Trace a copy of basic block.
First, draw the straight neckline on both front and back, then draw the new armhole on both, raising it by 3cm on shoulder line.
On front only, draw the underbust line and the panel line from underbust to hip line, extending the dart length up to this one.
On back, reduce waist dart and discard half of it from center back, then draw the panel cut.