Yardage equals 11 (12, 13, 14, 15, 16, 17) balls of Rico Essentials Soft Merino Aran yarn, shown in color 007 Brick Red

Also requires 6 buttons, 2 cm wide

(Matching Hat pattern is also included in issue 97 of Knitting Magazine.)

knitternq noted errata in Row 11 of the crisscross or bodice pattern:
P2, T5B twice, C6F, T5B twice, p2
The second T5B should be T5F.