What is the tie-like thing David Bowie's been wearing?

Factual Questions
1

What is the tie-like thing David Bowie is wearing in this picture? I’ve seen it on him at a number of his Reality tour shows, but I have no idea what it’s called. For all I know it’s just an old rag or bandanna, but it never hurts to get the details down.

http://www.davidbowie.com/bin/images/html/celine_bgham2_008_300k.jpg

2

Neckerchief?

3

I don’t know what it is, but I have to say, I saw him in Chicago and it was a GREAT show, he still looks like he 25. I really liked the thing with the lights/screens at the beginning.

4

Looks like a ragged bandanna.

Or a dog ate his tie.