The royal wore a new pill box hat, complete with a vintage hair net for the vigil in France – perfectly suited for the somber occasion

Credit: Samir Hussein/WireImage

In a series of commemorative events to remember those lost in the Battle of the Somme 100 years ago, Princess Kate gave a subtle nod to the past with her style choices.

Wearing a grey and black zig-zag patterned coat from Missoni over a black dress and wearing a new pillbox hat by one of her favorite London milliners, Lock & Co, Kate evoked comparisons to another fashion icon – Jacqueline Kennedy Onassis. Kate even wore a hair net over her low chignon during Thursday’s night’s vigil at Thiepval Memorial, adding another vintage element to the look.

The pillbox style hat gained popularity in the 1960s after the former first lady chose to wear one to her husband’s presidential inauguration in 1961. Since then, many royal women have favored the look, including the late Princess Diana.

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Kate memorably chose a similar hat stepping off the plane in New Zealand for the royal tour in 2014, when she wore a red pillbox hat by Gina Foster.

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On Friday, while visiting a war memorial, the royal shopped from her own closet when it came to her millinery, opting for black perching hat with ostrich feather detailing, also from Lock & Co. The newlywed wore it back in 2011 for her first Trooping of the Colour, just two months after her wedding to Prince William. She also wore it to a wedding that same year.