I wish I had a picture - I might have one at work, if so I will link it up tomorrow.
Last year for Halloween, I was Nothing. I wore all black - black robe, black shoes, black pants, black hood, with a black mask that obscured 100% of my face. It was really neat. I could see out, but no one could see in. I had a voice alteration gizmo hooked up so no one could tell who I was all day.
Later, I wore the garb to a party where I only knew a couple of people. I have never been more gregarious than I was that evening. For some reason, the knowledge that no one could see what I looked like made it really easy for me to approach people and start up conversations.
I now call the costume ‘instant ego boost’.