Princess Diana's second wedding dress was nothing like Kate Middleton or Meghan Markle's

The royal opted for an unexpected second outfit

Princess Diana's first wedding dress has gone down in history as one of the most iconic royal bridal gowns, but her second outfit is much lesser-known – and nothing like other royal brides.

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After walking down the aisle in a David and Elizabeth Emanuel-designed dress with a record-breakingly long train of 25 feet, the Princess of Wales changed into a very unexpected pink ensemble as she headed on her honeymoon with her new husband Prince Charles.

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WATCH: Prince Charles and Princess Diana leave St Paul's Cathedral after their wedding

Pictures show the newlyweds waving to crowds as they left Romsey Station for their honeymoon trip to Gibraltar in July 1981, with Charles looking dapper in a grey suit while Diana rocked a pink midi dress with a fitted waist and a jacket layered over the top, both designed by David Sassoon for Bellville Sassoon. She finished off her look with her short hair styled in its classic bouncy curls and a matching pastel-coloured hat and clutch bag.

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READ: Prince Charles and Princess Diana's engagement photos reveal 'disconnect' in their relationship – expert

The Princess of Wales was pictured at Romsey Station wearing a pink ensemble on her wedding day

In fact, two jackets with prairie collars and frilled sleeves were actually created for the ensemble - one with shorter sleeves (which she wore following her nuptials), and another with long sleeves in case of cooler weather. Genius!

With a classic silhouette and two jackets, the bespoke outfit later became part of the royal's working wardrobe - she sported the long-sleeved version on the royal tour to Australia in 1982, and to open a hospital in Grimsby in 1983. 

Kate Middleton stunned in a satin A-line second wedding dress

Meanwhile, her future daughters-in-law opted for much more traditional white gowns for their wedding days. The Duke of Cambridge's wife Kate Middleton swapped her Sarah Burton for Alexander McQueen lace gown for a simpler dress by the same designer featuring a satin A-line skirt and a sweetheart neckline, which she accessorised with a sweet cream cardigan. 

Meanwhile, the Duke of Sussex's new bride Meghan Markle changed out of her simple bateau neck gown by Givenchy and into a gorgeous halterneck dress by Stella McCartney for her evening reception. 

Meghan Markle opted for a Stella McCartney halterneck second wedding dress

According to People, Princess Diana almost didn't have her pink wedding dress, since she was initially turned away from the Bellville Sassoon shop in London. The then-19-year-old was reportedly shopping for an outfit for her engagement photos near closing time, and the sales associate recommended she visit the nearby Harrod's store after failing to recognise the royal.

"You can imagine how Belinda [Bellville] and David [Sassoon] felt when they realized the future Princess of Wales had been turned away," said Matthew Storey, Curator of Royal Style in the Making fashion exhibition at Kensington Palace.

Diana and Charles at their engagement photocall

Luckily, Diana returned to the shop with her mother and she went on to have a close relationship with the designers, who also created the blue ensemble she wore for her engagement announcement.

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