The Cinema Society with Piaget host a screening of EuropaCorp's 'Miss Sloane', New York, USA - 03 Dec 2016

Jessica Chastain knew that in order to transform into a lobbyist for “Miss Sloane,” she would need to do some research. So she started by figuring out what a lobbyist even is.

I didn’t really know what a lobbyist was,” Chastain admitted at a screening for the film at the SAG-AFTRA Foundation in Manhattan. “I read a book by Jack Abramoff and I thought, ‘OK, I need to understand a modern, day-to-day lobbyist, especially someone who was successful in that industry.’ How did they get to that place? And I needed to talk to women about it because as we all know, Washington’s a boys’ club and I needed to understand it from their perspective.”

And research she did. After interviewing female lobbyists in D.C. and playing the part of one in the form of Elizabeth Sloane, Chastain concluded that she’s “very different” from her character. But there are some similarities.

“[Sloane is] a hard, hard worker and I’m definitely a hard worker,” Chastain said. “At the end, she sacrifices, well, I don’t want to give away a spoiler, but she sacrifices herself for a cause. I’ve never done anything that noble and I hope to someday aspire to be thinking about a cause and risking everything for it. I think that would be something to admire and look up to.”

There might be one cause she’d stick up for. Chastain said her work on “Miss Sloane” didn’t change her political outlook, but it did give her hope. “It just made me excited to see more women in positions of power,” she said. “That’s something I’m really passionate about and I hope that after this current election and with films like ‘Miss Sloane’ coming out, it will inspire women to step forward and start running this country — and it will inspire us to vote for them.”

Read more about the costumes in “Miss Sloane” here.