Let’s draft the pattern of this jumpsuit.
Start from a bodice with shoulder dart and prepare also a basic pant.
Extend the shoulder line to drop it by 5-7cm, widen and drop at the armhole by 2-3cm.
Move from center front 1,5cm for the button stand.
On back, draw a slash line for the yoke and discard 1cm as a dart.
On front, draw the slash line from bust down.
Get a basic pant and merge the pieces with the ones from the bodice leaving few cm between them.
On front bodice, the shoulder dart is manipulated to the waist and left open.
Redraw the side seam and the inseam as the red lines you see.
Discard the pant darts and slightly lower the crotch.
Redraw yoke, back and front separate.
Draw the pants cuff and starting from a basic sleeve adjust it (dropping and widening the sleeve cap) until you meet the armhole measurement.
Add a two pieces collar and your pattern is ready!