From the designer:

The body is made from the center out with a crocheted circle that eventually morphs into a large granny square. From there, the square is folded in half and stitches are then picked up and worked in knitted rib, in the round on double-pointed needles, to create a sleeve cuff.

FINISHED MEASUREMENTS
• Sleeve edge to sleeve edge 24 (26)“/61 (66)cm
• Square 20 (22) x 20 (22)”/51 (56) x 51 (56)cm

GAUGE
4 mesh (3 dc in ch-1 sp, ch 1 = 1 mesh) to 4½“/11.5cm and 6 mesh rows to 4”/10cm using size H/8 (5mm) hook.