Yes aigrette, i think it's the Tudor Crown Royal navy, wore by naval officers.
" The naval crown (made up of alternate sterns and topsails) can be traced back to the Romans when a crown ornamented with a design of the 'rostra' or beak heads was awarded for bravery and was known as the 'Rostral Crown'. It can be seen on certain British Naval medals at the end of the sixteenth century. One of the earliest examples of the Naval crown in, practically its present form, is that which appears above the Arms of Greenwich Hospital dating from about 1700. The decoration, however, is wholly of square sails without the interspersed sterns." [National Maritime Museum web-site]