The iconic gown – which was designed by Sarah Burton of Alexander McQueen for when she wed Prince William on April 29 – will be the star attraction at the British royal residence's summer opening, from July 23 to October 3.
The dress will be exhibited alongside Catherine's tiara, shoes, jewellery and the couple's wedding cake.
Speaking about the cake, a source close to the couple – who are also known as the Duke and
Duchess of Cambridge – said: "Other cakes were made to serve to guests, but the one that was cut by the royal couple is the one that will be on display. There is a cut into it where the Duke and Duchess cut into it with a sword."
A spokesman for William and Catherine added: "The Duke and Duchess of Cambridge are delighted to give members of the public the opportunity to see, close-up, the skilled British craftsmanship that went into various elements of the wedding."
Meanwhile, the couple – who are set to take residence at an apartment in London's Kensington Palace - are advertising for household servants to take care of their day-to-day needs and notices have gone up at Buckingham Palace asking staff to apply.
A source told the Daily Mirror newspaper: "William and Kate might have wanted to have a simplelife and do everything themselves but it's just not possible.
"The whole place is buzzing with excitement. Lots of people will want these prestigious jobs. The royals always like to promote existing staff rather than bring in people from the outside."
Jobs available include housekeeper, butler, valet and dresser.