This cap is based on the red cap from the movie "The Professional". However, I have changed my original pattern a bit (added a row of shells) in order to make it longer. To obtain a more movie-consistent cap, omit one row of shells. In order to make the hat more like a beanie in length, add two rows of shells.
I bookmarked this site quite a while ago. There used to be an English version of the page but apparently not anymore. There are still some great patterns here though.