Originally Posted by Optimus_Prime_
Also has aviator sunglasses. See, that's why I think he's going to have various looks. It's almost like the sunglasses and T-Shirt were part of some disguise. Maybe he poses as a veteran? Then he ties his hair back, takes off the glasses and dons the robe.
I think they're just trying to evoke the look of a militant living on the fringe of society without a lot of money. Kind of like how you would see Cossack rebels fighting against the Soviet Union wearing T-shirts with soviet logos simply because they were the clothes they could get their hands on. He's wearing a novelty T-shirt because it's clothing he's got access to. I think that'll be the reason.