Maybe you could wear a white shirt, black trousers and nice black shoes, and have the shirt buttoned down a bit and wear one of these kinda scarves with it...
http://aardpiggy.com/black%20scarf%20for%20sale.gif
They are square when you lay them out.
If you have it so that its coming down in a triangle, not too far, and leave it hanging a bit loose around your neck...you dont want to look like its choking you. You'll have to undo the top couple of buttons but make sure your shirt isn't open too far...the scarf should be taking up most of the openness of the shirt. And try not to have it on the outside, it should be on the inside..but not bulging down inside the shirt, just dont have the scarf coming out over the opening of the shirt.
Also make sure it looks small enough so that it doesnt just look like you forgot to take your scarf off!
I think it looks pretty good, and your guaranteed no one else will be wearing it. It can look kinda pirate-esque too!
If you have a nice coat to go with it you would be sorted.