Let’s see how to draft the pattern of this jacket dress.
Start from a basic block with darts and a two pieces matching sleeve.
On both front and back, start by drawing the side panel starting a couple of cm below the waist and flaring it slightly at the hem.
Then reshape the center back and on both back and front draw the slash line for the side panels and redraw the darts accordingly.
Trace the separate pieces: center back, side back panel, center front (closing the bust dart), side front panel, facing, collar, two pieces for the sleeve, bottom panel to be flared (draw the slash lines and open 4-6cm in each cut).