From the description:

Who says you need to start at the top, the bottom, or even the side when you knit a sweater?

I guess in food terms, this is like starting with neither the dessert or salad course, but jumping right to the entrée, leaving the other less substantial dishes to come later. But all the parts of a sweater are there when you need them.

The front and back are cast on with provisional cast on, then knit out with mitered corners to the join for the sleeves. The body of the sweater is knit out for a few more rows to shape the underarms and to form the rest of the bottom and the sides. The shoulder seams are then sewn and the sleeves are knit from remaining the live stitches in one piece.

Finally the centers of the squares are grafted together, which makes an invisible join and hides the method of construction, but if the grafting intimidates you, feel free to use a 3-needle bind off.

FINISHED MEASUREMENTS
Chest: 3134, 37, 39, 43, 45.5, 49 inches
Length: 26.2526.75, 27.25, 27.25, 28.25, 28.5, 28.75 inches

MATERIALS
Yarn - Noro Silk Garden Lite 45% silk, 45% mohair, and 10% lambswool; 136yd/124m per 50g skein; color: #2034; 78, 9, 10, 12, 13, 14 skeins

Notions
Waste yarn
10 stitch markers; be sure one is different from the others
Stitch holders (optional; waste yarn may be used instead)
Yarn needle