Kathy Hilton Defends Kim Kardashian's Outfit She Wore at Christmas Party

Kathy Hilton is shutting down all the naysayers who had something bad to say about Kim Kardashian's outfit at Kathy's holiday party.

We got Kathy out in Bev Hills to get her thoughts on Kim's holiday fit ... after fans blasted her for missing the fashion memo.

Kathy makes it clear ... there was no theme for the party, and guests could wear anything they wanted as long as they were comfortable. She says there was nothing wrong with Kim's getup ... calling the whole thing silly and ridiculous.

ICYMI, the SKIMS founder rocked a cropped concert T-shirt and black leather pants, while others at the party were in festive holiday red and green ... as with many things, it didn't sit right with some folks on social media.

One user wrote, "did kim not get the message that it was a... CHRISTMAS party???" Another flat-out called her outfit disrespectful.