Use any chunky yarn to make this ribbed hat. Malabrigo Chunky or Dream in Color Groovy have great stitch definition in this pattern or bulky alpaca yarn is soft enough for even the most discerning of scalps.

Gauge: 4 sts/in in pattern UNSTRETCHED. This stitch stretches quite a bit, and so will fit a large head (22-23” circumference).

This hat is reversible as well - photo 2 shows the hat inside-out.
Knit longer, it could be worn with a large brim that showed the off-side, like a seaman’s hat - extra warm.

In French: http://casadolcecasa.canalblog.com/archives/2010/12/20/19906789.html