I will wear chocolate and a few other dark tones with a dark suit or sport coat, but NEVER with a tie. I try and dress it down a bit, but in my work environment I am still over dressed. I work around a lot of guys in slacks and sport shirts.
Yup- stay away from the bright tie. Traditional Menswear relies very much on line. The collar frames your face, the jacket frames the shape of your body to create a triangle, and thus the illusion of fitness in those that aren't, so on and so forth. with a dark shirt and a dark jacket, there's very little contrast, so the line mostly disappears. The light tie draws even more attention to itself, and away from the line of the collar and jacket. A tie in itself is a rather indistinct item for shaping the line of an outfit, it's a way to add color and personality to the other elements. The tie cannot dominate in a harmonious outfit, but the shirt or jacket, which both contribute to the line, can. The tie can dominate color-wise, but if it distracts, it spoils an outfit.
When George Cloony does the black shirt and suit thing, it's eliminates line and color, and basically makes the entire outfit indistinct, leaving you nothing to see but his face and neck framed by the v of the open collar. It works great for him becuase he's handsome, and can carry his look with just his looks. But add a bright tie, and all of a sudden you lose the framing of the V on the open collar, you lose the indistinctness of the entire outfit. You're focusing on the clothes again, and they don't compliment, in fact they detract.
If you're gonna do the dark shirt and dark jacket thing, no tie. Or tie that's darker than the shirt and doesn't distract. And it's best in soft light, which is why it's thought of as an evening look.