Try Wings+Horns. IIRC Lanvin and BoO did some luxe sweatpants too.
RE: Editorials -- I agree that visibility is a problem. I only ever see notice the editorials when I'm on the styleforum frontpage. It's always a pleasure to read them, but it seems like more of an effort than just clicking through the forums.
While we're talking about designers-qua-artists, does anybody know what the deal is with Aitor Throup? Those Siva bags generated a lot of hype and were admittedly really cool, but those and the other 3 items in his first (and only) "collection" can't possibly be netting him that much. The collection itself seemed to be mainly an installation piece, not something commercially viable.