You will need a closed zipper 8” (20 cm) in length,

Finished measurements:
Front or Back width: 15.75( 21.75, 27.5)“ 40( 50, 70) cm
Finished length: 15.75( 18, 20)” 40( 46, 51) cm

Yarn used:
Rowan Pure Cashmere
Shade 095 Light - 3(4, 4) hanks