Another, asking for bids of £200, said it was a "very rare collectors item for those who love the British Royal Family and British Royal Weddings".
Eugenie, 28, and Jack, 32, announced their engagement in January 2018 after eight years together.
It was the same setting as the lavish wedding in May of Prince Harry and his American actress wife Meghan.
The Princess of York is a long-time fan of the designers who she met while co-hosting an event in support of women artists.
Robbie Williams and Ayda Field arrive.
Fourth in line for the throne, the shortest bridesmaid bounded up the big steps.
They are the daughters of Prince Andrew and Sarah Ferguson, who are divorced but enjoy an amicable relationship.
People reports that Eugenie requested the low back so that her scars - which she got after having surgery at age 12 to correct her scoliosis - were very clearly visible. She has said previously it's important for people to show their scars.
It was reported guests had been asked to "surrender mobile telephones, cameras and any electronic devices used for image capture" for the afternoon reception at Windsor Castle, hosted by the Queen. The strong winds forced many women to hold on to their elaborate hats as they approached the chapel. She works in the art world.
While there's technically no rule against royal couples showing the public they actually like each other, Meghan and Harry's PDA often makes headlines because it's so unusual. There was no sign of 5-month-old Prince Louis, William and Kate's youngest child.
Britain will have its second royal wedding of the year when Princess Eugenie weds a tequila brand executive in a gala ceremony on the grounds of Windsor Castle.
The bride's parents left the chapel together smiling as the newlyweds embarked on a horse-drawn carriage ride through parts of Windsor. She showed up at St. George's chapel at Windsor Castle (if that sounds familiar, it's because it is where Meghan Markle and Prince Harry were Wednesday earlier this year) wearing a sleek, form-fitting tuxedo paired with a stylish top hat, sky-high black suede heels, and, oddly, a toothpick daintily perched on her lip.