Need help, what is this?

I got a unit way back, and in this unit there was a few trunks from the 30's and 40's.
Also there was alot of old books, these books was published between 1927 and 1953.

Among the books this litlle thing showed up, and it has the "old" olive green millitary color to it.
I have asked several people, everyone seems to think it is some kind of millitary thing, a part of a uniform or something.
But so far no one have not been able to tell me what it is and what it was used for.

Is there anyon in this forum who can help me find out what this is?

http://www.facebook.com/?ref=home#!/photo.php?fbid=146697262060394&set=a.138258676237586.26293.124251090971678&theater

Mr. A your link isn't working.

If you copy and paste it then it works.

It does now, it didn't yesterday.

It seems that they're driving glasses. http://texas.aoa.org/x10957.xml

My guess was some kind of outsert for a gas mask.  The shape of the lens is similar to the lenses for the M-17 mask, but that's not the kind of outsert that mask used.

Some guy told me today that this is a facemask used with a winter uniform. Is is more or less an attachment to a uniform for use during cold days. He said it most likely was from between the 1940 and 1960.
He also said is was mostly used by European troops, and not so much american troops.

If this is correct, i find it to be a cool item. To bad i don't have the rest of the uniform.