Kanye West always wants girlfriend Kim Kardashian to dress to impress, and he's willing to put his money where his mouth is.

On Sunday's Keeping Up With the Kardashians, rapper and designer West, 35 -- who penned a song about Kardashian called "Perfect Bitch" -- makes a deal with his girlfriend of five months: If she'll clean out her closet, he'll pick up the tab for her new wardrobe.

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"Look how dope this s--t is," West says, thumbing through Kardashian's racks of new clothes after the reality star ditches her beloved garments.

When Kardashian, 31, tries on one cleavage-baring green gown, West knows he's done his job. "[You're] getting on best dressed lists now. You're stepping into this territory. You look amazing -- it's a new Kim!"

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The couple's mutual love of fashion has helped keep the duo -- longtime friends before lovers -- closer than ever. "When this whole life is done, and it's just the two of us sitting somewhere when we're 80, you want to have things to talk about that you have in common," Kardashian recently told New York Magazine. "I think that's something maybe I didn't value as highly as a quality I cared about in someone."

Watch more of Kardashian's closet makeover courtesy of West in the clip above before Keeping Up With the Kardashians airs Sunday at 9 p.m. (EST) on E!

This article originally appeared on Usmagazine.com: Kanye West Makes Kim Kardashian Throw Out All Her Clothes