The white has gone slightly yellow, the neckline is stretched out. I have not worn the T-shirt for years, but I still don’t like to part with it.

I like the design too much.
It also makes me remember my New York years, when I lived with my two (Irish) cats on the 25th floor, temporarily also with a gentleman cat from Long Island, who was unceremoniously evicted by his wealthy family when the kids moved to college. But that’s another story.
Anyway, when I looked out the window back then, I saw the peaks of the Chrysler Building, Citicorp Center, and Empire State Building rising out of the sea of high-rise buildings. The twin towers of the World Trade Center must have been too far to the south or were hidden by other buildings.
I would love to know to whom the iconic skyscrapers have revealed (at a nightly hour?) their possibly true nature as Empire Cat, World Trade Cats, Citicat Center and Chrysler Cat ;-)
When the Kreuzeskirche in Essen obtained two large stained glass windows by New York Pop Art artist James Rizzi a few years ago, I wondered if the cats could be by him. As Rizzi had died not long before, I asked on Twitter if my T-shirt might be an early design by James Rizzi.