Sublime's Soya Cotton (50/50 mix) is a soft thick DK which gives good stitch definition and produces a nicely drapping fabric.
One word of warning though avoid mistakes. Ripping out even a few stitches gives you a horribly split yarn which is suddenly very difficult to work this.
I recently saw a pattern in this for a 60s fitted dress. I'd definitely look for an alternate for a project of that type, however careful you were there would be splits and loops at some point.
But otherwise this is a yarn I'd use again for smaller projects, like this Kelly cardigan.