Construction:
The KDBY Scotty Sweater is a raglan sweater, knitted in the round from the top down. After the yoke, stitches are placed on hold for the sleeves and the body is finished in the round. Finally, the sleeves are knitted onto the sweater.
As the neckline is large enough, I have not increased the back by short rows so that the pattern can also be knitted by less experienced knitters.

Gauge
After washing, unstretched:
Stockinette stitch: 10 x 10 cm = 17 sts x 29 rows (I used needle size 4.5 mm)
K2P2 pattern: 10 x 10 cm = 18 sts x 29 rows (I used needle size 3.5 mm)

Yarn held together:
Drops Flora together with Drops Kid-Silk

Size S uses 3 skeins per yarn
Size M uses 4 skeins per yarn
Size L uses 5 skeins per yarn
Size XL uses 6 skeins per yarn