Clinton's Choice to Wear White at Debate Conveys Struggle of Suffragists, Says Expert

White reminded voters that she's "the women's candidate," says a fashion editor.

Clinton has worn Ralph Lauren's designs often since kicking off her campaign. For example, she wore a cobalt blue Ralph Lauren suit for the campaign's opening rally last year in New York City.

But it's her choice of color — not designer — that's significant.

Moore added, "It also serves as a reminder to voters, during a time when Trump has been under fire for lewd comments and accused by 10 women of inappropriate sexual behavior, that she is the women's candidate."

There's even a connection between Clinton's wearing white and being a candidate.

Israel Waismel-Manor, a senior lecturer at the University of Haifa's school of political science, told ABC News, "'Candidate' comes from the Latin word 'candidatus,' which means 'white robed.' It signifies you are clean, have nothing to hide, pure. Trump is the opposite."

Trump's ensemble — a dark suit, white shirt and red tie — also sent a message, Moore said.

"The red tie is about the most traditional inside-the-Beltway GOP male power uniform you can get," she said. "Seems to be trying to show he belongs."