Royal fashion is very specific. Protocol requires senior members of Europe's royal families to dress in such a style that is both chic and modest. Naturally, many of these princesses turn to the same designers again and again, and every so often, they wear the exact same looks.
Here are nine times princesses were caught in the same outfits, plus one striking American example, we couldn't help but include.
Princess Mary of Denmark & Princess Charlene of Monaco
Left: Princess Mary of Denmark attended a business seminar at Hotel Gajoen Tokyo, wearing Vilshenko in October of 2017.
Right: Princess Charlene of Monaco wore the same floral dress one year earlier, though she styled with black pumps as opposed to nude, at Monaco's traditional end-of-summer picnic in September of 2016.
Catherine, Duchess of Cambridge & Princess Mette-Marit of Norway
Right: Crown Princess Mette-Marit wore the same dress at the Canadian Museum of History back in November of 2016.
Princess Victoria of Sweden & Queen Maxima of The Netherlands
Left: Crown Princess Victoria of Sweden attended the christening of Prince Alexander on September 9,
Right: Queen Maxima of the Netherlands visited the Champalimaud Centre in Portugal on October 11, 2017, wearing the same lace number.
Queen Maxima of The Netherlands & Princess Charlene of Monaco
Left: Queen Maxima of the Netherlands attended the opening of the new season of the Koninklijke orchestra in Amsterdam back in September of 2015, wearing one of the more daring looks on this list: a Valentino jumpsuit.
Right: Princess Charlene of Monaco also wore the same look that
Princess Marie Chantal of Greece & First Lady Melania Trump
Left: Earlier this summer, Crown Princess Marie Chantal wore a long-sleeved, floor-length Valentino to a gala dinner in honor of the King and Queen of Norway's 80th birthdays.
Right: First Lady Melania Trump opted for a shorter version of the same Valentino floral to watch the 2017 Bastille Day military parade along Avenue des Champs-Elysees.
Princess Sofia of Spain & Catherine, Duchess of Cambridge
Left: Princess Sofia attended Spain's National Day military parade on October 12,
Right: Just one month earlier, Catherine, Duchess of Cambridge was spotted wearing the adult version while on a royal tour of Canada.
Princess Claire of Luxembourg & Princess Mette Marit of Norway
Left: Princess Claire of Luxembourg attended the 2016 National Day Celebration in Luxembourg wearing a pastel Vilshenko dress.
Right: Crown Princess Mette Marit of Norway wore an extremely similar Vilshenko style on the exact same day during a royal event at Stiftsgarden in Trondheim.
Crown Princess Victoria and Crown Princess Marie-Chantal
Left: Crown Princess Marie-Chantal of Greece attended Derby Day in Epsom, England wearing a pink Dolce and Gabbana dress with button accents.
Right: Just days later, Sweden's Crown Princess Victoria wore the exact same style (though she opted for a less-striking topper) to Princess Leonore's christening.
A Royal Favorite
Designer Jenny Packham's gowns are a royal favorite, and not just of the Brits'. Here are four different occasions when princesses wore her style:
Alexandra Princess of Sayn-Wittgenstein-Berleburg celebrated Queen Margrethe's 40th jubilee in a crimson version of Jenny Packham's dress back in January of 2012.
Princess Alexandra of Luxembourg attended the wedding of Prince Felix of Luxembourg and Claire Lademacher wearing a purply-blue gown on September 21, 2013.
Catherine, Duchess of Cambridge arrived at a gala celebrating the Olympic and Paralympic teams of Great Britain wearing a jade green version of the dress in May of 2012.
Princess Madeleine of Sweden attended a gala in New York in the same number in October of 2013.
Catherine, Duchess of Cambridge & actress Meghan Markle
Left: Catherine, Duchess of Cambridge arrived for the 2014 Royal Variety Performance wearing Diane von Furstenberg's Zarita dress.
Right: Actress Meghan Markle may not be a royal just yet, but she's close enough that we're willing to put her on this list. Here she is attending an event for USA Network in 2012, wearing a shorter, navy blue version of the Zarita, two years before Duchess Kate stepped out in the style.
*This story originally appeared on Townandcountrymag.com.
*Minor edits have been made by the Townandcountry.ph editors.