This sweater is knitted in one piece to the armholes, and works up quickly in bulky yarn. There are really cool top down set-in sleeves, and you will learn short rows while working the sleeve cap as well. If you work the sleeves in the round, the only seams are tiny ones at the shoulders. Full diagrams are included. You will need a long size 10 1/2 circular needle, plus a 16” one in the same size for the sleeves.