Most casual-wear looks similar for the simple reason that it's achieved the form of exactly what a dude wants to bum around in -- but does that mean you must look like every other bum? Distinguish your lazing around with Modern Amusement.
MA's a SoCal label that takes brightly colored, extremely wearable gear and imbues it with subtle touches so well thought out, you'll wonder why the designers don't apply their energy to something important, like cancer research, or finding another place to hide cheese in a Pizza Hut pie. The magic starts with reversible pima-cotton hoodies and v-neck sweaters, each offering interchangeable solid/striped options; meanwhile, polos come with long, lean bottoms designed to look good tucked or not, and half-sized collars short enough to be popped without causing people to assume you've got a numeral in your name. Bottoms-wise, the lightweight cotton twill pants and shorts sport touches like classic oxford stripe lining, and a slim cut that makes them equally suitable for semi-formal occasions (with a blazer) or grotesquely informal affairs (without a blazer, or a shirt).
MA also offers graphic tees, enzyme-washed for uber-softness, many sporting artsy prints of the designers' bare-breasted female friends that'll make you look buttoned-up by comparison (because try as you might, you can't out-casual naked).