Brand? I'm neither rich enough nor shallow enough to choose my cloths based on brand, or to judge others based on the brands they waste their money on.
My style is "authentic".
When I'm in a casual mood it'll be non-branded tracksuit bottoms or cargo pants with a polo shirt, probably with a nerdy logo of some sort on it. If it's cold, replace the polo shirt with a hoody, again, with something geeky/nerdy on it. In mid summer replace the polo shirt with nerdy T-shirt and the tracksuit bottoms/cargo pants with cargo pants shorts.
When I want to be a little less casual then green or tan chinos with a short-sleaved shirt (I HATE long sleaves).
If you really force me I do have slacks and dress shirts, but I avoid them when ever possible, and if I have to wear them they'll probably be a deep vibrant blue or a pastel green with a nerdy tie.
B.