Anything that is made for your head is a hat!
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Bring a water talisman, a plain tiara then go to the water altar, and use the tiara on it, you will lose the water talisman, but you will obtain a water tiara.
i thing the tiara club is free
To make a mind tiara, take a normal tiara and a mind talisman to the mind altar.
There is a small crown of some sort, but it costs a lot of bells and is rarely on sale. You can buy it at Mable's shop, just like any other hat.
If you are asking how to make a normal tiara into a water tiara then it is simple. You take a water talisman and a normal tiara into the water alter. Use the talisman on the alter and it should make the tiara into a water tiara which allows one click entry to the alter and one more rune spot to craft.