Serious question: What does one wear to the Florida Derby? The thoroughbred race, known more formally as the Curlin Florida Derby, returns to Gulfstream Park in Hallandale Beach on Saturday, and I’m flummoxed (not to be confused with the racehorse of the same name). I am familiar with the fashionable crowds that attend the Kentucky Derby and the Preakness Stakes, sartorially splendid and seersuckered, feathery wide-brimmed hats at a rakish angle.