From the website:

Bergholt Stuttley Johnson, commonly known as Bloody Stupid Johnson, was the greatest inventor in the history of Terry Pratchett’s Discworld. His inventions, on the other hand, never quite followed … intentions.
This particular hat started out as a Quantum Mechanics assignment, and ended up a warped mass of head-warming cables.

GAUGE
24sts/28 rows = 4 inches in stockinette st
36sts/36 rows = 4 inches in cable pattern

FINISHED MEASUREMENTS
Circumference: 23 inches

Helpful information:
Chart B is worked as follows:
Rows 1-27, 12-27, 12-27, 28-36. Also, picking up 3 sts for every 4 rows does not work. Just pick up the remaining 60 sts evenly while working the 68-row Chart B. Again, when picking up sts for the crown, the 4:3 pickup ratio does not work. Just pick up 132 sts evenly around. I divided the circumference by 4, placed markers and picked up 33 sts between markers.