V- neck tops -- especially if they have short flutter sleeves. I have realized that flutter sleeves create a stronger shoulder line which visually slims the waist. (As a fellow apple the waist is NEVER slim :-))
Clare is also on to something with peplum -- with nondescript hips this is a real help to balance out my proportions.
I am also a big fan of tunics, but they need to come in at the waist or be belted so that it doesn't look boxy.