Here’s the strangest thing I’ve learned in a while. Silk doupioni is a type of silk fabric that is riddled with irregularly spaced slubs, which give it a certain charm. It is a popular choice for bridal gowns. I had thought it was the result of a special kind of weave or less processed method of creating the thread. But it is actually the product of a double cocoon. Sometimes two silkworms will nest in the same space and spin interwoven cocoons. The thread that unravels from this cocoon is tangled and nubby, thus producing the texture of the doupioni. I can only suppose that since this is a fabric in demand, there are silk manufacturers who are crowding their silkworms together into close quarters when they are done feasting and ready to spin. You can read more on silkworm cultivation and silk manufacturing.