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Now Playing: 08-17-12 Marketplace Mid-day Update

In South Africa, more than 30 workers have been killed by police at a platinum mine. The workers, who were armed, were staging what police said was an illegal strike. In Illinois today, unionized workers at a Caterpillar plant will vote on a contract to end a four month strike of their own -- a strike that has put the state's governor in an awkward position. And you know the look... guys around the office in button-down shirts and khaki slacks. We take it for granted now as the business casual “uniform,” but it wasn’t always. So how did the modern office dress code come to be?