Do your clothes have to be black and white? The description on the event doesn't really say it. Does dark navy blue count?
Here's the official attire thread: http://www.facebook.com/l.php?u=http%3A%2F%2Fwww.tumblr.com%2Fdashboard%2F55%2F85958620922&h=uAQF7TGuN
And no the clothes don't actually have to be black and white, its just a formal event.