1 front on fold, 1 back on fold (use the dashed line for the back neck), 2 sleeves on fold, 1 neckband
Seam allowances are 1/2″.
Fold neck band in half (wrong sides facing) and mark the 1/4 points with pins.
Sew sleeve to armscye, right sides together.
Sew underarm and side seam.
Stitch hems with a zigzag, double needle, or other stretch stitch.