The Surprising Secrets Behind Princess Diana's Iconic Wardrobe

Charles and Diana had been dating for around six months before they got engaged, and although the young heiress was already a household name, there was some confusion when it came to selecting the outfit she would wear to announce her engagement. Royal favorite Bellville Sassoon was earmarked, but the assistant there didn't recognize Diana and she was sent away, and so an off-the-peg outfit was chosen from deluxe department store Harrods instead.

Diana's first official event as future princess was a charity fundraiser. She selected a divine taffeta gown created by her wedding dress designers, the Emmanuels, without realizing she had committed two royal faux pas, for which she was roundly criticized. The first was that she chose a black dress, as she'd not been informed that royal women didn't really wear black, other than for funerals and Remembrance ceremonies. The second is that the neckline was seen as too revealing for a future member of the Royal Family.

Diana later referred to the night as "terrifying" and "a horrendous occasion," telling her biographer Andrew Morton the reason behind her choice: "Black was the smartest color you could possibly have at the age of 19. It was a real grown-up dress."

Diana wanted a wedding gown that was big, and a train that was long. The designer Elizabeth Emmanuel later revealed, "We wanted to fulfill people's expectations of what a princess would wear. The ultimate princess dress ever." She added that when Diana was informed the 25-foot train was longer than any other in royal history, Diana was thrilled. The dress featured 10,000 pearls, and was stitched inside with a miniature horseshoe for good luck.

A typical Diana look in the early years of her marriage was straight from the 1980s princess handbook: clouds of silk, satin and taffeta, puffed sleeves, ribbons, lace, bows, diamonds, and tiaras. In her first year as a princess, Diana was put in touch with then Vogue deputy editor Anna Harvey, who set her on the path that she later developed further on her own.

Diana visited Washington DC in 1985, and took a turn on the dance floor with one of Hollywood's hottest stars at the time: John Travolta. The iconic image flew around the world, and the Victor Edelstein dress later sold for £240,000, or $310,938.

As Diana found her feet, her style evolved in the latter half of the '80s, and the princess dove headlong into high-octane glamour. She favored sequins, bright colors, and shoulder pads – as well as re-working more than one piece of royal jewelry into a jewel-encrusted headband.

So-called during the infamous "War of the Wales's," when Charles and Diana's feuding became public and both gave revealing TV interviews giving their sides of the story. On the night Charles's interview was televised, Diana turned up to a charity gala in a high-cut, low-cut Christina Stambolian cocktail dress, and was splashed all over the front pages the following day.

In the '90s Diana started stripping away her royal accoutrement, and favored a sleek, pared-down look with clean lines, simple colors, skirt suits, and smart cocktail dresses. The princess started wearing big name designers such as Versace and Chanel.