Ghost With Hood
Long white robe complete with hood. No one will have a clue that it is you.

Terrifying Ghost
If you are leaning a little toward horror, this should do the trick.

Ghostly Apparition
Instead of a hood, the face is on view, but wearing a long, long white wig. Should definitely appeal to women.

Ghost With a Mission
This has to be the most evil looking ghost that I have found so far.

Ghost With Style
Now this was something I wasn't expecting... a ghost in a knee length dress with a robe. I am amazed at how many variations that I am finding!