Soy Underwear
http://www.coolhunting.com/archives/2007/02/2xist_soy_under.php
2xist has come out with a line of underwear which is 95% soy and 5% nylon. Soy is a highly renewable crop that has a huge range of uses including: oils, soap, cosmetics, resins, plastics, inks, crayons, solvents, clothing, and biodiesel. Soybeans are also used as fermenting stock to make a brand of vodka. Soy also has many applications in the food industry as a replacement for many dairy and meat products, and is a source of complete protein.
Unfortunately at this point, the 2xist collection is only for men’s underwear, but “today, very high quality textile fibers are made commercially from “okara” (soy pulp), a by-product of tofu production”(Wikipedia). So there is hope for more and more designs to use this.