Robin, 45, and her 23-year-old co-star both struggled to get to grips with the costumes for the movie set during the Civil War as they filmed in 100 degree heat on location in Savannah, Georgia.
Robin said: "I will never put on a corset again. I vow to never wear one again. That was the toughest part of the role, wearing that in the 100-degree heat on the set."
Evan added: "Having to walk around with your own gravitational pull was insane. I don't know how women did that. Robin and I kept talking about that the whole time. Even sitting down becomes an event."
Evan also struggled with the lack of make-up as she admits she "can't leave the house without mascara" although her less than glam on-screen look did help her to get into character.
She is quoted as telling People magazine: "It's part of the territory. Playing a historical person, it helps. I didn't think I looked anything like the [character] until they put the eyebrows on me, and The Hair. It's kind of eerie."