A long, formal dinner dress of blue silk velvet Designer - Victor Edelstein A midnight blue silk velvet dinner dress with off the shoulder straps and a slight bustle. Labelled: Victor Edelstein, London. In 1985 Princess Diana wore this dress to a State Dinner at the White House hosted by President & Mrs. Reagan. Edelstein had designed this Edwardian inspired gown just for this very formal occasion. That evening the Princess danced with Clint Eastwood, Neil Diamond and finally, famously, with John Travolta. Diana wore the dress again, with the Spencer tiara, to a state dinner in Germany.