Kate, 41, stunned in an ivory silk crepe dress by one of her go-to designers, Alexander McQueen.
The fashion house was the choice for her 2011 wedding dress, designed in collaboration with creative director Sarah Burton.
The sleek cream-coloured dress was covered in silver embroidery with a nod to the four nations of Great Britain; rose (England), thistle (Scotland), daffodil (Wales) and shamrock (Northern Ireland) motifs were all detailed in the thread work.
The British designer also created the coronation dress for Charlotte, third in line to the throne, with matching satin stitch embroidery of the four nation’s flowers and the addition of a satin cape.
At the request of King Charles and Queen Camilla, both the Prince and Princess of Wales are wearing traditional mantels and robes, and the princess is not wearing a tiara.
Instead, Kate opted for a banded headpiece by Jess Collett and Alexander McQueen with coordinating silver bullion, crystal and silver thread work three-dimensional leaf embroidery
Princess Charlotte’s band is in the same floral style as her mother’s, continuing their co-ordinating style, and the pair both swept their brunette locks into matching low plaited buns.
It's the first time the mother-daughter duo have channelled in exact matching mini-me outfits, previously preferring to coordinate with subtle details.
Tributes to the late Queen and Diana
As with most of her styling choices, Kate’s jewellery paid tribute to the women in husband William’s life, including diamond and pearl earrings that belonged to his mother, the late Diana, Princess of Wales.
Her three-strand diamond necklace, the George VI Festoon Necklace, belonged to the late Queen Elizabeth.
King George VI commissioned Crown jeweller Garrard to create the graduated diamond necklace for his eldest daughter, the then Princess Elizabeth, in 1950.
The king instructed the Crown jewellers to use 105 loose collet-set diamonds from the royal vaults to make the necklace, reportedly heirlooms from his mother, Queen Mary, from 1911.
The grand heirloom features 83 brilliant diamonds cut down to collets, set as three graduated chains and joined by a single clasp at the back.
Princess Charlotte and Prince Louis will attend the coronation for their grandfather, King Charles, in the audience, whereas Prince George plays a more integral role in the ceremony as a page of honour.