Isabel Marant has always been one of those designers I found shoppable for my own personal tastes and body type. I have two tops from her I bought in Paris in 2002 that I patch and repair every year because I haven't found anything since to replace their prime positioning in my whittled-down wardrobe.
I've not been her biggest fan as of late; the drive to be seen as a more high-end designer rather than a contemporary wardrobe staple has made her a little less reliable for me. Still, Marant always has great sweaters and she employs them well in her collections by making them not only interesting and salable but completely relevant to her message. My hunch is her knitwear is by far her best-selling category.