Jeans and a long-sleeved shirt, plus a hoodie and maybe a t-shirt underneath the shirt if it's cold enough. Most of my clothes are black, white or grey, with a little blue here and there, and regardless of the weather I always cover up - I hate having any part of my body that isn't my hands or face exposed.
I dress semi-casual - I could (and have) wear any of my shirts to work, and the jeans are always black. But it's comfortable enough, which is all that matters~