Assistant Lucy Bishop displays detachable sleeve panels on Princess Diana's Emanuel ball gown from the 1986 'Diaghilev' collection at Kerry Taylor Auctions in London November 27, 2013. The dress is expected to earn 50-80,000 pounds (US$ 80-130,000) when it goes on auction December 3. REUTERS/Suzanne Plunkett (ROYALS SOCIETY FASHION ENTERTAINMENT)