We call people who love cats "cat people". Their love for cats is beyond the imagination of ordinary people. They use cups with the pattern of cats, cover the cups with the pattern of cats, and see the shadow of cats everywhere in their lives... It may sound crazy, but we have to admit that cats and our cat onesies are generally so magical that you can't help but notice them and want to own them.
Come to think of it, as a cat enthusiast, there are other things you might be less than happy with, such as cat pajamas!