The Lantern Hat is a hat unobtainable in the store in PFS. The hat is a carved out pumpkin, fitting the head.
So Farmer Joe forgot to sell his quality pumpkin patch for Halloween in time. With only 2 days to go until the big day, he had to make something unique to make a profit.
Luckily, he had a son who liked to pillow fight with his friends at his Farm. Noticing the tacky lack of headgear they were wearing, Joe had a bright idea to sell some delicious headgear.
It worked like a treat.