Start from a basic block with appropriate ease allowance and shoulder dart. Choose the length (around 9-12cm from the waist, but depends on your height and the style you prefer).
Draw the double breast button stand (7-8cm) and mark (with + and – the button and buttonhole position).
On both front and back draw the panels and the slanted dart manipulated between them.
On front, draw the pocket from the panel cut toward center front and draw the line for manipulating the shoulder dart into a dart ending at the panel.