You can start with a dark greyish brown suit. Try a charcoal grey pinstripe or an oxford grey sharkskin. The key here is to direction attention to the face and get your face to light up. You do not want to be a mass of color without features.

If you pick a patterned suit you can wear a patterned tie or shirt, but it's more probable that you will get a patterned tie and solid shirt, so, pick a pattern that's different in size than your suit.

You're probably a low contrast guy and it's hard to say without really seeing you, but with the proper colors you can really bring forward your face and eyes, which is what folks should be noticing.

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman