For everybody that does not know COS: it's short for "collection of style" and is a brand that operates under the wings of H&M. You could say it's their premium line that is sold under a different name. Style wise the look they go for is what you would get when you throw Jil Sander, Acne and Raf Simons in a blender. I think by now 30% of my wardrobe is from COS.
Above a sneak preview of the COS s/s 2010 collection.