Have you ever thought about where your underwear comes from? If you're an eco-conscious, socially responsible shopper like me, you probably buy organic dairy and free-range grass-fed meats, as well as earth-friendly dish soaps, detergents, and shampoos. You might also have your fruits and vegetables delivered each week from a local farm. If you're at the far end of the spectrum, you might not purchase leather products. You might even try to stick with (and to) t-shirts, hoodies, and yoga mats made from organic materials. But underwear, socks, and undershirts? I bet most of us still pick those…