So after deriding Cos for selling shapeless clothes and being told by the Mumsnet Style Massive that I was wrong, I went into one of their stores and actually bought two items of clothing! They're beautiful quality so I am willing to accept I was wrong, although there were still a lot of odd shaped pieces and at one point I wasn't sure if I'd wandered into the men's department by accident!
These were my purchases, although as I like my clothes more fitted I had to buy a small in the top as the medium was huge on me.