To attend a panel discussion at King's College, Markle dressed in a monochromatic Reiss dress with a black blazer and matching heels.
The pops of white in Markle's outfit were thought to be a nod to the Suffragette movement, as reported by Elle.
According to CR Fashion Book, Emmeline Pethick-Lawrence is credited with making white the color synonymous with the Suffragette movement in 1908. Other colors worn during the movement included purple, green, and gold.
International Women's Day celebrates the "social, economic, cultural and political achievements of women" and "also marks a call to action for accelerating gender parity," according to the organization's official website.