looks to me like an ordinary flannel shirt with the sleeves rolled up...you can find those in just about any store..if you want it the way he wears it just get a small one and roll the sleeves up.
The guy selling that shirt will probably be someone who wishes they did something with their life and their soul is probably crushed into a million pieces.
The person that makes the shirt is probably a guy in a giant factory or it's a machine
They made me do push ups in drag

I'm gonna have a really hard time if we're both cannibals and racists.

Don't dress as a whore, he'll thump you.

I'm a firework, primed to go off
You can find flannel shirts like that pretty much everywhere that sells clothing. They're rather popular right now.