Start from a basic block without darts and loose ease on bust circumference – something like 18cm on total circ.

Extend front and back up to the desired length, then draw the button stand as a parallel 3cm outwards from center front.

Mark waistline on back and front.

Widen back and front neckline by 1cm.
Lower back neckline in center by 0,7cm and redraw the shape. Cut on the new line and measure it.

Starting at right angle from front shoulder line, draw a perpendicular to it with back neckline measurement.

Square up by 4 to 5cm (collar height) and draw a curved line up to center front.

Rotate the collar backwards to make it fit better:

• first draw the perpendicular to collar from high shoulder point
• then cut through this line and open 2cm on collar edge, so that the back part of the collar rotates outwards (to your left)
• lastly redraw the collar outer shape merging to front button stand.

Make sure you keep center back collar at right angle to back neckline and collar edge.