Trace your back and front with darts with 10cm wearing ease at bust, 8cm at waist and 4cm at hips. Trace also the matching sleeve, then:

• raise shoulder points by 0,5 to 1cm (depending on the shoulder pad thickness)
• reduce back dart by 1,5cm total and discard it from center back, blending to zero at shoulder blades and hip level
• draw new hemline 5 to 7cm above hip level and flare by 1 to 2cm at it, blending to waist
• on front, draw button stand 2cm wide (red line, measure from center front outwards), then draw the rounded hemline at center front
•  choose neckline depth and draw the roll line (blue line) from center front to a point 1,5cm past high shoulder point
• draw the underbust style line (yellow line) and a slanted line parallel to roll line and at 4 to 5cm span from it.

Then cut through new back line and erase old back dart lines.

On front,

• lengthen roll line upwards by back neckline measurement
• draw a line from high shoulder point parallel to roll line and as long as back neckline
• rotate the upper point of this line towards left (outwards) by 2,5cm (blue arrow) and redraw the line (red line)
• draw front pocket line from waist dart 4cm below waist to side seam 6 to 7cm below waistline.

Cut through front lines too.

Here is back, ready, and front, to be manipulated a little more.

Cut through front underbust curved line and through front underbust dart. Tape shoulder dart closed and open a matching volume at underbust.