Originally Posted by slumcat
I think that is his look from the HellCarrier in the Avengers.
There's 3 - Caped Sleeveless, Sleeved, and Capeless Sleeveless. The last one is the most informal one and the most comfortable one I imagine and this is what we see above.
It looks like he has a tumor on his bicep. He's gunning for Popeye.