I took my son to Pearl River on Broadway & Walker in Manhattan yesterday after his appointment to see a hand specialist to treat a broken finger. He loves to look at novelty items (AKA junk). They have lots of weird cat stuff including these hats to put on your cat. These are adorable, but they do not look too comfy to me. I would not recommend this!
Some cats may allow you to put hats like those pictured on them, but not many. I think the issue with those hats is they cover the ears too tightly. Below is my cat Abby (she passed away last month). She would let me put looser style hats on her, at least for a short while.
My son did pick out a sushi cat key chain which I also found on Amazon: