Idea #1

What you will need:

* red dress (or mini dress) with black or yellow accessories
* black or red boots / shoes
* horns

Optional:
* black or red stockings
* black or red glovelettes
* Devil's tail
* Devil's fork
* Devil wings
* red wig

Idea #1. Costume of Wicked Witch of the West

The Wicked Witch of the West is a fictional character and the most significant antagonist in L. Frank Baum's children's book The Wonderful Wizard of Oz (1900). The witch's most popular depiction was in the classic 1939 Hollywood movie based on Baum's book, where she was portrayed by actress Margaret Hamilton. Hamilton's characterization introduced green skin and this has been continued in later literary and dramatic representations.

What you will need:

* black or green dress
* Witch's hat
* broomstick
* black boots or shoes

Optional:
* horizontally-striped stockings (green and black)
* glovelettes
* Witch's makeup (brown and green smudges)

See Also Wicked Witch of the West Makeup Ideas and Tutorials