On sale February 28th, Emma Watson has revealed a bit of her third and final collaboration with eco-label People Tree.

The 20-year-old actress, best known for playing the character Hermione in the "Harry Potter" films, is passionate about the fashion industry - particularly with leveraging the design process to benefit the less fortunate.

“I wanted to help People Tree produce a younger range because I was excited by the idea of using fashion as a tool to alleviate poverty and knew it was something I could help make a difference with,” she said in announcing the partnership last year. “It has been the most incredible gap year project.”

Beyond the 100% organic and Fairtrade certified cotton, each collection is also made entirely by Fair Trade groups by hand - using hand weaving, hand knitting and hand embroidery to create livelihoods for some of the most disadvantaged people in India, Bangladesh and Nepal.

“I think young people like me are becoming increasingly aware of the humanitarian issues surrounding fast fashion and want to make good choices but there aren’t many options out there,” said Watson.

While Watson helped design last year's spring collection in-between takes for the last "Harry Potter" film, this most recent collaboration was done while studying at prestigious Brown University in Rhode Island.

"I designed the collection last year after I'd started university in the U.S," Watson explains. "Safia, People Tree's founder, and Misato, People Tree's designer, came out to work with me in Rhode Island. Together we decided on all the colours, fabrics, shapes and craft skills. Most of all, we took care to design a really wearable collection that truly celebrates the traditional skills of People Tree's Fair Trade groups around the world."

While fans might be disappointed that this is Watson's last take with People Tree, they can certainly look forward to the young fashionista's new big collaboration with designer Alberta Ferretti. That collection, also sustainable and using organic fabrics, will launch later this year and is said to be eco-chic with a “classic, ’60′s Jane Birkin” vibe.

Check out the spring 2011 collection, which includes pieces like jersey harem pants, blazers, and draped dresses, by hitting the official "Love From Emma" People Tree site here.

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Emma Watson teases final People Tree collection
'Harry Potter' star reveals her spring (and last) collaboration with eco-clothing company People Tree.