Richard in a Hat

The havelock helmet cover is basically a bit of fabric that fits over the whole helmet including any brim The cover has an elasticated edge ...

Havelocks were originally created for military use, but they are also used to decorate other helmets, this particular havelock was designed ...

 A Havelock is not a hat, it's a hat cover or to be more accurate a helmet cover Mainly used by the military to change the look for say ...