Colors have been a big part of women's movements throughout history.
The suffrage movement in the U.K. used purple, green and white. Purple was a hat tip to justice and dignity, green for hope and white for purity.
International Women's Day and other women-specific events around the globe also use purple.
A wave of feminism that started in the '60s used yellow alongside purple.
And with more recent women-centric movements, new and old colors are coming to the scene.
On Election Day 2016, some Hillary Clinton supporters opted to wear white. It was an ode to the U.S. suffrage movement. Clinton said had she won, she would have rocked white for her acceptance speech.
And most recently, women and allies have been donning black to protest sexual assault and abuse in various industries.