Put on your pantsuits, ladies (and gentlemen)! It is time to vote! In case you haven’t heard of Pantsuit Nation, the super secret Facebook group for Hillary Clinton supporters, here is the low-down.

Pantsuits took off during the 1960s and, since then, have made waves. They were often seen as inappropriately masculine and were deemed unacceptable under certain circumstances, like the United States Senate. In defiance of the rule Barbara Mikulski and Carol Moseley Braun wore them onto the floor in 1993 and changed the political fashion world forever.

Hillary Clinton has really put the pantsuit on the map. She even descried her campaign staff as “The Sisterhood of the Traveling Pantsuits” during her speech at the 2008 Democratic National Convention.

Supporters of the first female candidate to really have a shot at the “Big Seat” in the United States formed an invitation-only Facebook group called Pantsuit Nation. Many states have their own chapter, and there is even one in Canada. There is a public page now, as well. The aim was to provide a safe space where progressive women and their allies can support one another.

The group has been around for about 18 days and has about 1.9 million members, according to the Washington Post. The group was reportedly formed by 33 year-old Mainer Libby Chamberlain. The group is growing rapidly, and it’s not just about donning the legendary garment as you go to the polls. Posts also include women from all age groups sharing their struggles and experiences of the journey women have taken to be recognized in domains largely dominated by men. Women (and a few men) also share stories of being Clinton supporters trapped in Trumpland. Of course, the trolls have found the public page, but the private pages are forbidden fruit. Negativity isn’t allowed. The page’s founder told the Washington Post it is a place for members to come and express their “shared enthusiasm”. Ultimately, the pantsuit has now been embraced as the new symbol of “girl power”.

By tomorrow, the next chapter will be started. It may be history-making; it may spell disaster for the United States. But, for now, pull up your big-girl pantsuit and go vote if you live in the States.