'Button' designer spills beans on Brad Pitt's 'sagging' bottom

Costume designer Jacqueline West, who received an Oscar nod last week for her work in "The Curious Case of Benjamin Button," has also been nominated by the Costume Designers Guild, which will bestow its awards Feb. 17.

But dressing Brad Pitt to look old and flabby was one of the hardest parts of her job.

And the hardest part of that was making Brad's rear -- so lovingly revealed in the 1991 film,"Thelma and Louise" -- look ancient.

"That was another big challenge, making Brad's body look old and sagging the clothes out in the bottom and cutting them so they wouldn't show his perfectly sculpted bottom."

Read more about the period '50s hats Brad Pitt asked Jackie to make for him (and maybe for his son Knox, who has been seen in Japan wearing one that looks just like Brad's). And how Cate Blanchett persuaded director David Fincher to go with "that red dress."

Seems David hates red.

Although maybe not so much anymore.

Then check out Scott Feinberg's Envelope blog and put in your two cents for the most iconic film dresses of all time.

C'mon, film fashionistas. Show your stuff!

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Photo: Brad in "Thelma and Louise," when his rear view was more youthful. MGM