Very unusual choice, indeed. I only ever remember seeing it worn during visits to France.
BAYEUX, FRANCE - JUNE 06: Queen Elizabeth II Attending A Service For The 50th Anniversary Of D-day. (Photo by Tim Graham/Getty Images)
Queen Elizabeth II arrives at the Gare du Nord station in Paris, 05 April 2004, for the start of a three-day state visit to mark the centenary of the Entente Cordiale, the colonial-era promise of cross-channel friendship between Britain and France. (Photo credit should read THOMAS COEX/AFP/Getty Images)