Actress Margaret Hamilton, as the Wicked Witch of the West
My girlfriend turned me on to this story of Why Do Witches Wear Pointy Hats? written by Katy Waldman at Slate.com and I found many of the links interesting, especially the one about the mummies of East Central Asia which I have read some of before. Fascinating.
I don’t own a pointed witch hat, just two robes with pointed hoods. Is that good enough?