There's a reason Mondo Guerra shared his story about being HIV positive on the reality show "Project Runway." It's just at the time, he wasn't quite sure what it was.

In hindsight, though, Guerra thinks he was compelled to it because "now I have the ability to bring attention to a cause," he says.

In a new partnership with online retailer Piperlime, Guera is raising money for AIDS research by designing two limited-edition T-shirts, on sale beginning Dec. 1, to coincide with World AIDS Day.

For each shirt sold, $20 will be donated to amFAR, an organization that focuses on AIDS research.

One shirt shows a tree with a single heart hanging from a branch and the other features a colorful skull in the Day of the Dead theme that dominated Guerra's final collection on the TV show.

The T-shirts are for women, though Guerra notes, "They actually printed a male version in extra small just for me."

- Samantha Critchell, AP Fashion Writer