The Trickster Hat is a hat unobtainable in the store in PFS. The hat is a a skeleton mask.
It 'twas a cold Halloween evening when the young trickster came to my house. Alas, I stole his mask a decided to make copies of it. It was a skeleton mask so next year instead of giving candy, kids give Stars to me to buy this mask.
Unfortunately, I can only seem to sell them during the Halloween period. I have no idea why. Maybe a skeleton mask during summer isn't trendy enough.