Unveiling Kate's Secrets: What Will She Wear on the Big Day?

March 3, 2011— -- Details on Kate Middleton's gown are under lock and key, but a thinly "veiled" secret is what the bride wears on her head is almost as important as the gown itself.

Diana, Sarah Ferguson and Sophie, all brides who married into the royal family, just like Kate is about to, walked down the aisle with their veils concealing their faces. It wasn't until later in the ceremony, in Diana's case after the vows, that their faces were revealed. But throughout history, no princess by birth has covered her face with a bridal veil. Although according to the Huffington Post, most still wear a veil on their head.

"A veil, to me, is very important. It's sort of the finishing touches of a very beautiful day and a very beautiful dress," said Lindka Cierach, the designer behind Ferguson's dress and veil in 1986. Her veil incorporated a dusting of hand-beaded sequins and a lace trim of guipure flowers, a nod to Ferguson's family crest.

In 1947, Queen Elizabeth wore an exquisite tulle veil when she wed Prince Philip, and in 1981, Princess Diana famously wore a veil that stretched nearly 24 feet long.

That veil also incorporated an extremely rare piece of Britain, a bit of silk from England's only silk farm. Lullingstone Silk Farm has provided silk to the British family since 1937 for big events such as coronations and weddings. In addition to Princess Diana's veil, Lullingston silk was included in Queen Elizabeth's wedding dress. But if Kate wants to wear silk, she will have to find it outside Britain, because the farm has since shut its doors.