What Armor is Tony Stark Wearing in this Picture?

Here's an interesting photo of Robert Downey Jr. sporting some kind of light Iron Man armor. I'm not even sure what movie this is from, I'm guessing it's from Iron Man 3, but it could be some kind of unused concept design from The Avengers. My first initial thought was that it was some form of under armor, but it also has some battle damage on it. I guess if a blast it hard enough from the outside it could show up on the under armor. All I know is I don't recall ever seeing Iron Man wearing something like this. Maybe I missed something in the comics, but regardless of what it is, it looks cool! 

If you know what this suit is, and what it's used for please let us know! The picture was sent to us with no link to source where it came from.

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