'Tabby': The Cat's Out of the Bag
The silk wasn't plain; it had an irregular wavy finish. It was made in Baghdad, in a quarter of the city called Al-‘Attābīya, and the origin of the fabric eventually lent its name to the fabric itself: the silk became known as ‘attābī.
The name for the cloth was adopted into Medieval Latin as attabi, and then into French as tabis. English speakers modified the word to tabby in the early 1600s. They didn’t connect it to cats at that point though: the word was used solely for plain-woven silk cloth with a wavy moiré pattern.
As the Internet has taught us, however, cats have a way of inserting themselves into all aspects of our lives. Within a few decades of the adoption of the word tabby, the word was also being used to describe the markings on the coats of some cats. By the late 1700s, the word was being used to describe the cats themselves as well.
Eventually the fabric meaning of the word faded from prominence, and tabby was free to (eventually) devote itself wholly to memes.