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Forget one-for-one businesses, if you want to do something good in the world, try changing your underwear.

That's been the tagline for PACT, a San Francisco-based socially-conscious clothing company that was co-founded by Jeff Denby in 2009. And though the company has expanded to items and product lines beyond undergarments, the goal still resounds today: to use fashion as a force for good.

In addition to using environmentally friendly manufacturing facilities and packaging, the company collaborates with and helps support charitable organizations. But rather than just write a check, PACT incorporates a charity's mission into its product designs. No Hanes plain-vanilla undies here.

Check out Entrepreneur's video for the full story.

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This post originally appeared at Entrepreneur. Copyright 2013.