No bow-tie shows the white hair special effect trick...
In an attempt to Seussify Mike Myers body shape into the Cat as much as possible, the Cat design utilized the pattern of the white hair to create the form of the Cat from the book as much as possible, while the black hair kind of fades out Mr. Myers true body shape. Movie Magic! That's Jeff Jingle back there laughing it up, he's the Cat Tail puppeteer and mechanics man.
The Cat's Make-up Artist: Jamie Kelman
Prosthetics Designed and Produced by Edge FX