J. Law tells MTV News normally wears bras, but had to forgo them for David O. Russell’s 1970s-era film.

“American Hustle,” David O. Russell’s latest directorial effort following last year’s critically acclaimed “Silver Linings Playbook,” is notable not only for its script and performances from the likes of Christian Bale, Amy Adams, Bradley Cooper and Jennifer Lawrence, but also for its bananas aesthetic. Set in New York and New Jersey of the 1970s, the cast is decked out in the full finery of the era, which means they’re often short on supportive undergarments.

MTV News’ Josh Horowitz caught up with the film’s stars this weekend in NYC, where Lawrence made it known that she was aware of how memorable her costumes would turn out to be.

“I normally wear bras,” Lawrence deadpanned.

Asked if she liked being done up in big hair and ’70s garb, the Oscar winner was similarly dry: “I wouldn’t say that it’s ever exciting to see yourself without a bra in a dress that’s three sizes too small for you.”

And since the costumes were period-appropriate, she said, she couldn’t make character rationalizations that would have her donning an underwire. “Exciting, I don’t know,” she said of going braless. “It was freeing.”

Of course, since it doesn’t count as a conversation with Lawrence unless she gets some goofs in, she ribbed Horowitz when he admitted that in his notes while watching the film, he “wrote ‘hair’ and I wrote ‘boobs’.”

“That was just you zoning out,” the star teased Horowitz. “And I bet it said ‘boobies,’ not even ‘boobs.’ ”

“American Hustle,” starring Amy Adams, Christian Bale, Bradley Cooper and Jennifer Lawrence, hits theaters Dec. 20.