Which fabric is made by worms?

Actually they are not worms; they are caterpillars and the strands of silk are spun to form their chrysalis.

thus the word silkworm textile

They are actually a moth and the silk is the cocoon they spin to pupate in from the caterpillar to moth stages. In order to unravel the cocoon it has to be heated in water and thus the caterpillar is killed in the process. Caterpillar 's are usually raised on a diet of mulberry leaves.

It's made of by their cocoons