Knitwear for rounded shoulders?

[Hamnvik]

I am looking for help to find something that will suit my rounded fat shoulders/upper arms. These slouchy cardigans/jumpers that are in all the shops don't suit me at all but I'm not sure if there is another option I can't think of? Help please!

Oh I'm only 5ft and a size 12 if that helps.

I saw a red and cream/white cardigan in M&S today which I liked, boxy shape and round neck so prob not remotely what you want but it was nice and bright!
www.marksandspencer.com/Collection-Geometric-Print-Cardigan/dp/B0019SQNW6?ie=UTF8&ref=sr_1_2&nodeId=43083030&sr=1-2&qid=1391189485&pf_rd_r=04PZH91HDEFAW2PMENHD&pf_rd_m=A2BO0OYVBKIQJM&pf_rd_t=301&pf_rd_i=0&pf_rd_p=321381407&pf_rd_s=center-3

It looks brighter in real life.