I made this one out of Cascade Ecological Wool, which is a great substitute for the O-wool that I made the original with. (I actually have a sweaters' worth of Gorgeous O-wool that I'm planning to knit a THIRD Boyfriend Cardigan with.)
I've been trying out eco / organic wools on my last few projects, because I have eczema on my fingertips, and I think that the dyes & stabilizers in non-eco wool are really making it worse. Some yarns are so bad that my hands are bleeding after just a few hours of knitting. I can use both O-wool and this Cascade Eco Wool without much issue. I'm on the lookout for yarns that are truly wonderful & gentle on the hands, so if you have any suggestions, please comment and let me know!
Craftsy project link: www.craftsy.com/project/view/Eco-Boyfriend-Cardigan/18945