After the service Saturday, as she stood with her new husband on the church stairs, Camilla kept a steadying hand on the head-dress, which was covered in gold leaf and tipped with crystals.
But for the actual wedding ceremony, which was held earlier in the day, Camilla chose a swirl of a dress in cream silk topped by a matching coat.
The outfit was crowned with a stylish and intensely feminine straw hat overlaid with ivory French lace and trimmed with a fountain of feathers.
Charles' Clarence House office said the dress designers Robinson Valentine wanted a "crisp clean look with subtle detailing" for the civil ceremony at Windsor's town hall.
The royal wedding rings were made of Welsh gold taken the Clogau St. David's mine and the River Mawdach in the Kings Forest, Clarence House said.
The new duchess' coat, in oyster silk basket-weave, featured subtle herringbone embroidery while the silk chiffon dress, hemmed with vertical rows of appliqued woven disks made in Switzerland, peeped out beneath.
Work on the outfit began Feb. 21 and the final fitting was on April 5.
Britain's new Duchess of Cornwall wore pale beige suede court shoes with almond-colored toes and a 1.9-inch heel.
Her clutch purse was made from embossed calf leather with a half-flap closing and lined with suede.
Flowers in the marriage room came from Charles's Highgrove country estate in west England and Raymill House, Camilla's home nearby; there was a lot of lily of the valley, symbol of the return of happiness.
For the service of blessing at St. George's Chapel in Windsor Castle, the duchess changed into another Robinson Valentine design, a long, fitted silk porcelain-blue dress and high-collared coat embroidered with gold thread, with a slight train; Clarence House said shades of blue and gold were her favorite colors.
"Robinson Valentine believed the dress required a sense of occasion for St. George's Chapel and so the aim was a flowing, elegant line, concentrating on proportion, fit and silhouette," Clarence House said.
"The print and the embroidery create texture whilst retaining the lightness and subtlety of the fabric."
The outfit was inspired by a piece of jewelry that had belonged to the duchess's mother; Robinson Valentine researched embroidery, technique and fabric in the textile collection at the Victoria & Albert Museum and decided the desired effect required them to create their own fabric.
On her head, the duchess wore a feather head-dress covered in gold leaf and tipped with crystals.
Her shoes were pale gray shot silk with subtle gold embroidery detail on the toe, and she carried a small, simple bouquet of gray blue and yellow flowers tied with the same kind of silk used to make her dress.
The design team of Anna Valentine and Antonia Robinson was established in 1986 and has a salon in London's Kensington district.
The duchess' hat was by Irish-born milliner Philip Treacy, who has worked for the French fashion house Chanel, is known for the daring of his creations.