The beaded neckline of a Catherine Walker black velvet evening gown worn for a Vanity Fair photo shoot by Britain's Princess Diana is adjusted by house assistant Lucy Bishop at the Kerry Taylor auction rooms in London, Thursday, Feb. 28, 2013. The dress estimated to realise 50,000-70,000 pounds ( 77,000-108,000 US Dollars) will be sold in the Fit For a Princess auction in London on March 19. (AP Photo/Kirsty Wigglesworth)

A Victor Edelstein midnight-blue velvet evening gown worn by Britain's Princess Diana when she danced with actor John Travolta in 1985 at the State dinner at the White House given by President and Mrs Reagan, is adjusted by house assistant Lucy Bishop at the Kerry Taylor auction rooms in London, Thursday, Feb. 28, 2013. The dress estimated to realise 200,000-300,000 pounds ( 310,000-464,000 US Dollars) will be sold in the Fit For a Princess auction in London on March 19. (AP Photo/Kirsty Wigglesworth)

A Catherine Walker sea-green sequined evening gown worn for the State visit to Austria by Britain's Princess Diana is adjusted by house assistant Lucy Bishop at the Kerry Taylor auction rooms in London, Thursday, Feb. 28, 2013. The dress estimated to realise 30,000-50,000 pounds ( 46,000-77,000 US Dollars) will be sold in the Fit For a Princess auction in London on March 19. (AP Photo/Kirsty Wigglesworth)

Beading detail is shown on a Catherine Walker burgundy velvet sheath with embroidered tailcoat worn for the State visit to Korea in 1992 by Britain's Princess Diana, at the Kerry Taylor auction rooms in London, Thursday, Feb. 28, 2013. The dress estimated to realise 40,000-60,000 pounds ( 62,000-93,000 US Dollars) will be sold in the Fit For a Princess auction in London on March 19. (AP Photo/Kirsty Wigglesworth)

The bolero is adjusted on a Catherine Walker Mughal inspired embroidered pink silk evening gown made for Princess Diana's State visit to India in 1992, at Kerry Taylor auction rooms in London, Thursday, Feb. 28, 2013. The dress estimated to realise between 80,000-120,000 pounds (124,000- 186,000 US Dollars) will be sold in the Fit For a Princess auction in London on March 19. (AP Photo/Kirsty Wigglesworth)