All seam allowances are 1/2″ unless otherwise stated. See chart below for sizing specifications. Note, this specific pattern is available up to a size 30.
First, form your pocket and stitch it into place on the front of your hoodie. I did this by folding the top edge down 1", which you can blind hem stitch into place. Fold the remaining three edges inward 1/2", pin and stitch with your machine.
Attach the front and back of your hoodie at the shoulders and side seams using a regular seam. I recommend pressing the seams open and top-stitching them down to reduce bulk.
Create your hood similarly, using a regular seam and pressing it open. Your pattern piece has a small notch to guide you on where to fold the front edge under; since boiled wool does not fray, I folded mine once and stitched it. For other fabrics, you may want to fold the raw edge inward 1/2" or so before stitching.
Here, use your recommended plier kit to insert a grommet 1" from the bottom edge of your hood. (Note, I initially forgot to do this! Which means, you cannot see my grommets in the next step.)
Next, attach your hood along the neckline, overlapping the front slightly. Once attached, I recommend stitching the seam allowance down.
Create each of your sleeves and set them into their respective armscye, matching up any notches. Simply roll the sleeve upward to finish each.
To finish the bottom edge of your hoodie, fold the edge upward and inward and stitch similarly to your hood. Feed your twill tape through the hood casing and trim to size.