Notes from the designer, Flor:

While the directions for this cap may appear complicated at first glance, it is really an easy hat to knit.

The cap is knit flat and sideways and is reversible. You may choose your favorite side before sewing the back seam. Knitting this cap with a plain yarn of one color shows the knitting pattern best. This pattern makes a nice lightweight, warmer weather chemo cap when knit with DK yarn. Do not use a thick (bulky) yarn for this pattern.

Gauge: approx. 20 sts = 10 cm (4”).
For DK yarn, 22 sts = 10 cm (4”)

Materials:
1 pair size 8 single pointed needles
(or you may use double pointed needles, or a round needle)
Approx. 220 yds. (200 meters) of worsted weight or DK yarn
Option: small plastic marker