The best of American television graced the red carpet at the annual 66th Emmy Awards in Los Angeles — moved from a Sunday to Monday for scheduling reasons — and there was no doubt what the dominant theme of the evening was in the fashion stakes. Online and at the Nokia Theatre, much of the talk centered on Julia Louis-Dreyfus, who won the statuette of lead actress in a comedy for “Veep.” She sported an eye-catching twisted and draped Carolina Herrera halter gown. She apparently looked so ravishing that Bryan Cranston, who was to go on and take the best actor in a drama, planted a lingering kiss on her lips as she sashayed up to collect her award. “I’m just as nervous now as I ever have been,” Louis-Dreyfus, who reportedly washed her flowing dark locks in the kitchen sink, told reporters as she blitzed the red carpet.