That's one weird tree...

Witches grow on trees. It starts with the hat, the rest grows out later during spring. When the witch is fully grown, the entire branch falls off. the witch will turn this branch into a broomstick and flies away.

I did not put all the hats in the tree, but I did make my costume. If you want to know how I did that, go here:
 

the horns have their own jewellery too now: that looks so nice!