A to Z Challenge – Letter Y

You wouldn’t think the word YARN fits the speculative fiction genre. Maybe it doesn’t. Maybe this cover would do better for a book about knitting. Or maybe the yarn itself is magical. Anyway, for the letter Y, here is my take.

If there was magical yarn, what would it do? What would a sweater made of it do? Would it make you invisible? Would it cure any illness? Or would it turn your skin green?