I was just showing my brother (An RAF Officer) the different uniforms the navy wear. We were looking at No 3s and saw that down at the bottom it says that GDR can be warn with a tricorne! Is this for real? If so, does anybody choose this option or have you seen anybody wearing one? I presumed these things had gone out about 150 years ago. It has ocurred to me that this may be the name for the female hats though.