This thrummed aviator cap begins at the top and increases along four lines, much like the directional winds. The cap is made extra luxe with a touch of silk, and extra warm with thrums, which are bits of fiber worked into the fabric. The earflaps are finished with I-cord tails. You’ll be toasty warm despite the chilly upper atmosphere!
This pattern is in the book Doomsday Knits, which is currently available at cooperativepress.com, as well as here on Ravelry.
There's a link to my video on how to thrum in the pattern. Here's an extra link for continental style knitters, in case your thrums are not looking like V's: