This is a pattern for a chemo hat. It incorporates three stitch patterns: scallop cast on, arrow stitch and Irish mesh.

The scallop cast on is unique and the directions with pictures is included in the pattern. It may take some time to get used to the method, but the results are very attractive and feminine.
This can be knit as a regular hat by increasing the knit rows between the decrease rows to 2 instead of 1. .