Jeans
Nothing more durable, nothing more comfortable.

Long sleeve t-shirt
Hides the fact that I've never worked out in my life. Also hides the mokey arms. And my hairy arms. Hides a multitude of sins.

T-shirts
Again with the comfort. I ain't me unless I'm comfy. Plus they say so much about me. Superman t-shirt, Foo Fighters T-shirt...