I Was a Teenage Mutant
Now, if there’s one thing all those comics and cartoons have taught us about mutating, it’s that it’s really anybody’s guess what you’re going to get. Super awesome psychic powers? Very possibly. Extra limbs and general blobbiness? Also pretty likely. Luckily for this hat, its mutations are pretty benign and mostly take the form of an unusual crown structure.
This pattern is in the book Doomsday Knits, which is currently available at cooperativepress.com, as well as here on Ravelry.