Anything that draws the eye upward, like an interesting neckline, a scarf, or even a statement necklace, will detract for your hips.
I like a slightly longer sweater, but nothing that clings to your rear. This is a good example of a sweater that both draws the eye up toward the ruffles and isn't too fitted:

I also like the color-block cardigan on the left (below), especially with the darker color on the bottom. (Sorry, I could not separate the two images.)
