As a plus-sizer (well I prefer calling myself curvaceous), I just love cowl neck sweaters. People tell me I shouldn't. Why? Because I have a bust, I suppose. What I think more likely is that they're jealous that I can wear cowlnecks and that I always feel good wearing them.
Anything that has a batwing or magyar sleeves will always compliment a shapely woman. (Quite often too it's possible to go for a smaller size because the batwing effect gives so much more room about the bust and midriff).
So take a look at these from Avenue (http://www.avenue.com).
First a Cowlneck Diamond Sweater
And then for a change white not go for white (yes, don't believe the critics, we can all wear white and we can look stunning). Again from Avenue.