I have several of these 4/3 Sleeve shrugs by Calvin Klein, all of them in black until I purchased the white one.  I really love the way they fit, hitting just above the waist.  Other cardigans that come to/past the waist can make me appear bulky, but these accentuate the waist.  I wear mine mostly with dresses and sleeveless Calvin Klein suits, but they are also great over a tank top with jeans for casual wear.