... at least that's the only reason I can think of that the Kook would be a cheese-eating, surrendering Frenchman today. See Wikipedia for the history.
The notion of the surrendering French is not typically associated with the French Revolution, however, but with the surrender to the Nazis early in WWII. But the date most closely associated with that surrender is June 22, 1940, the signing of the armistice with Germany. Premature Kook?
What's your theory for this costume? Random act of France mockery?