What is it he's actually wearing? Because if it was an animal, he could have shot it to get it's skin...hence the bullet hole thing. I think he was abandoned as a child by his fellow race and those Salamander things adopted him...

could be...
it' probably a kind of poncho, I dunno what it's made from

It looks like seperate pieces of the same material stitched together.

one sentence....Poncho fur coverings made of alloy

Looks like leather to me. But from the bullet shots, it looks like wood...

well this just proves stranger is either agile or just does a load a sneak kills or hes just not stupid enough to get shot cept once but now we have to ask ourselves how many bullet shots will be shown on his poncho when youve completed stranger?. im betting over 100

I doubt they will show bullet holes on him. That would be a lot of effort for something you really cant see (except for in supersized rendered images like that)