I've been eyeing this hemp and organic silk top from kelly b for months. Use code GWGFASHION50 to grab it (and all other regularly-priced men's and women's eco-fashion) for half off at Green With Glamour. Sale items are already marked down - up to 75% off. (I'm also a fan of this Elle Top from Toggery).
If you're wondering, like I did, how exactly silk can be organic, instead of imagining worms chowing down on organic grub (like I did), this comprehensive article may shed some light.