Queen Elizabeth II's rainbow wardrobe: 93-year-old monarch doesn't dress to blend in

PHOTO: Queen Elizabeth IIs StylePlayGMA Photo Illustration, Getty Images
WATCH The evolution of Queen Elizabeth II's style

Rainbow colors are in trend this month for Pride, but Britain's Queen Elizabeth II has been doing it for decades.

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The queen is an icon and a world leader, but also a fashion legend for her bright outfits.

The colors of the rainbow-style outfits are a trend started by Her Majesty as a courtesy to the public, according to Sali Hughes, a U.K.-based journalist and author of "Our Rainbow Queen: A Tribute to and Her Colorful Wardrobe."

PHOTO: Queen Elizabeth wearing bright colored coats with matching hats in a set of photos at various events in 2018 and 2019. Getty Images
Queen Elizabeth wearing bright colored coats with matching hats in a set of photos at various events in 2018 and 2019.

"The Queen tends to always wear one color because she feels that if people are queuing for many hours just to see her, the courtesy she should show them is make it so they can see her," Hughes told "Good Morning America." "Those in the audience will be able to pick her out and say they saw the queen."

(MORE: Grandma goals: A look at Queen Elizabeth II with her grandkids and great-grandchildren)

That is also the reason you likely will not see Queen Elizabeth wear a green coat and hat to a garden party, for example, where she would run the risk of blending in.

She always picks contrasting colors and ones that are diplomatically and culturally appropriate to the event, according to Hughes, whose book will be available in the U.S. in October.

"So much thought goes into it and nothing is an accident," she said. "If anyone thinks they’re overthinking the queen's fashion, they’re not, because they would never be able to think about more than the queen and Angela Kelly.

Kelly is Queen Elizabeth's personal fashion expert. She started working for the royal family after the queen met her at the home of the British ambassador in Germany, where Kelly worked as a housekeeper at the time.

PHOTO: Queen Elizabeth II sits next to Anna Wintour and Caroline Rush (left), and royal dressmaker Angela Kelly at a show during London Fashion Week, on February 20, 2018. Reuters
Queen Elizabeth II sits next to Anna Wintour and Caroline Rush (left), and royal dressmaker Angela Kelly at a show during London Fashion Week, on February 20, 2018.

Kelly worked her way up the ranks and now even designs many of the queen's clothes and hats, according to Hughes. The pair work together, relying on no outside stylists, and pore over every detail of each event Queen Elizabeth attends.

"Everything is considered," said Hughes. "All the clothes are weighted down with metal weights, fabrics are packed up for several weeks to make sure they don’t wrinkle and new shoes are worn endlessly around the palace to break them in."

Speaking of shoes, those and her purse are the only accessories where Queen Elizabeth breaks away from her monochromatic look. She always wears patent block heel shoes and carries a handbag, both in white or black, depending on the season.

Elizabeth Holmes, a California-based journalist who chronicles the royal family's fashion at So Many Thoughts, calls Queen Elizabeth's fashion consistency "admirable."

PHOTO: Queen Elizabeth II visits Hauser & Wirth on March 28, 2019 in Bruton, Somerset, England. Toby Melville/Pool via Getty Images
Queen Elizabeth II visits Hauser & Wirth on March 28, 2019 in Bruton, Somerset, England.

"She knows what works for her," Holmes said. "There is something so refreshing in her color choices, especially as so much of fashion has veered towards neutral shades. The queen’s style is very much her own, and she wears it well."

When the royal family makes appearances together, like they will at Saturday's annual Trooping the Colour, their outfits are planned around the queen's wardrobe choice, according to Hughes.

"Whatever the queen is going to wear, everyone works around that, not because she rules with an iron fist but because the monarch has final say," she said. "She wouldn’t approve their outfits but they would know what the queen will wear."

With those details in mind, here are some of Queen Elizabeth's most colorful looks over the years.

PHOTO: Queen Elizabeth II makes her way underneath a large, colored umbrella, to a dais to watch the Durbar of the Ashanti Chiefs, at Kumasi Sports Stadium in Ghana, Nov. 15, 1960. Bettmann Archive/Getty Images
Queen Elizabeth II makes her way underneath a large, colored umbrella, to a dais to watch the Durbar of the Ashanti Chiefs, at Kumasi Sports Stadium in Ghana, Nov. 15, 1960.
PHOTO: Queen Elizabeth II visits with a group of local children during her state visit to Mexico, March 1, 1975. Serge Lemoine/Hulton Archive/Getty Images
Queen Elizabeth II visits with a group of local children during her state visit to Mexico, March 1, 1975.
PHOTO: Queen Elizabeth II visits with students at Evora University in Evora, Portugal, March 28, 1985. Tim Graham/Getty Images
Queen Elizabeth II visits with students at Evora University in Evora, Portugal, March 28, 1985.
PHOTO: Queen Elizabeth II greets people on her way to board the yacht Britannia for a cruise, Aug. 7, 1996, in Portsmouth, England. Tim Graham/Getty Images
Queen Elizabeth II greets people on her way to board the yacht Britannia for a cruise, Aug. 7, 1996, in Portsmouth, England.
PHOTO: Queen Elizabeth II, wearing a green coat and matching hat, attends the Royal Windsor Horse Show, held at Home Park in Windsor, Berkshire, England, circa 1980. Tim Graham/Getty Images
Queen Elizabeth II, wearing a green coat and matching hat, attends the Royal Windsor Horse Show, held at Home Park in Windsor, Berkshire, England, circa 1980.
PHOTO: Queen Elizabeth II is joined by Catherine, Duchess of Cambridge, Princess Charlotte, Prince George, Prince William, and Prince Philip, on the balcony during the Trooping the Colour, June 11, 2016 in London, England. Samir Hussein/Getty Images
Queen Elizabeth II is joined by Catherine, Duchess of Cambridge, Princess Charlotte, Prince George, Prince William, and Prince Philip, on the balcony during the Trooping the Colour, June 11, 2016 in London, England.
PHOTO: Queen Elizabeth II attends the Royal Ascot, June 22, 2018 in Ascot, United Kingdom. Mark Cuthbert/UK Press via Getty Images
Queen Elizabeth II attends the Royal Ascot, June 22, 2018 in Ascot, United Kingdom.
PHOTO: Queen Elizabeth ll arrives at Aberdeen Airport with her corgis to start her holidays in Balmoral, Scotland in 1974. Anwar Hussein/Getty Images
Queen Elizabeth ll arrives at Aberdeen Airport with her corgis to start her holidays in Balmoral, Scotland in 1974.
PHOTO: Queen Elizabeth II and Prince Philip, Duke of Edinburgh visit the Solomon Islands during a tour of the South Pacific in October, 1982. Anwar Hussein/Getty Images
Queen Elizabeth II and Prince Philip, Duke of Edinburgh visit the Solomon Islands during a tour of the South Pacific in October, 1982.
PHOTO: Queen Elizabeth ll looks at vintage vehicles used by the First Aid Nursing Yoemanry during World War II, in which the Queen herself served, in the quadrangle at Buckingham Palace on June 28, 2007 in London, England. Anwar Hussein Collection/Getty Images
Queen Elizabeth ll looks at vintage vehicles used by the First Aid Nursing Yoemanry during World War II, in which the Queen herself served, in the quadrangle at Buckingham Palace on June 28, 2007 in London, England.
PHOTO: Queen Elizabeth II reviews the Guard of Honour at the Canadian Forces Base in Winnipeg, Canada, Oct. 7, 1984. David Levenson/Getty Images
Queen Elizabeth II reviews the Guard of Honour at the Canadian Forces Base in Winnipeg, Canada, Oct. 7, 1984.
PHOTO: Queen Elizabeth II and Prince Philip, Duke of Edinburgh, watch traditional dancing in Tarawa, Kiribati, Oct. 23, 1982, during a tour of the South Pacific. David Levenson/Getty Images
Queen Elizabeth II and Prince Philip, Duke of Edinburgh, watch traditional dancing in Tarawa, Kiribati, Oct. 23, 1982, during a tour of the South Pacific.
PHOTO: Queen Elizabeth II is presented to the Keys of Portsmouth by the Mayor ahead of the National Commemorative Event commemorating the 75th anniversary of the D-Day invasion on June 5, 2019 in Portsmouth, England. Jack Hill/WPA Pool/Getty Images
Queen Elizabeth II is presented to the Keys of Portsmouth by the Mayor ahead of the National Commemorative Event commemorating the 75th anniversary of the D-Day invasion on June 5, 2019 in Portsmouth, England.
PHOTO: Queen Elizabeth II inspects the troops at the passing out parade at Sandhurst Military Academy in Berkshire, England, in 1985. Patrick Ward/Corbis via Getty Images
Queen Elizabeth II inspects the troops at the passing out parade at Sandhurst Military Academy in Berkshire, England, in 1985.