Cavalli, 72, said the Chanel's creative director's dressing sense of teaming black sunglasses with a signature black suit is ridiculous, reported Contactmusic.
"Just because you are an artist you don't have to dress like that. Karl Lagerfeld, he looks ridiculous," Cavalli said.
However, Lagerfeld is very comfortable with what he wears.
"I remember one time in winter in 1956 - it was beyond cold. And I went to see my father at the George V with only a suit on. He said to me, 'But you will die! You will get pneumonia!'