The Obstacles Hat Pattern is now available for purchase. 
This pattern takes approximately 150 yards of worsted weight yarn - wool is recommended, though it might be lovely in a wool/alpaca blend for a bit more slouch.
Needles:
US 6, 16” circular needles used to knit the ribbing
US 10.5, 16” circular and double pointed needles used to complete the balance of the hat
Other Materials:
cable needle
stitch marker
tapestry needle
You can purchase it as a single pattern for $5.00
It's is also part of a 3 pattern e-book collection for $12.50 - City Cables Collection