The dress I wore out last weekend was a very straight up and down, flowy piece. It didn't show off any waist or bum, and had a high neck line. Paired with a body chain and outrageously high heels, even He's jaw dropped.
HE's EDITORS NOTE: This is actually an exceptional rule. As much as He wants to see as little clothing as possible, its not realistic, and it won't look good. Showing off one sexy part of your body at a time is a great way to draw attention without over doing it.
P.S. Here is a list of underrated female body parts - shoulders, hip, ankles, back,