Getty Images

Invest in a wrap dress.

Universally flattering, asymmetrical cuts whittle down your waist and hide trouble spots. Designer Diane von Furstenberg, who popularized the look, explains: "A wrap dress does exactly what it claims: It wraps you. And because it's typically made of jersey fabric, it molds to your body, helping to sculpt it."

Sport a V-neck top

The neckline narrows as it plunges--the lower, the better--emphasizing the length of your neck and upper body and giving the illusion of a leaner line.

Avoid pleats

Whether they're on the waist, hips, or neckline, extra fabric and fussy details like ruffles and gathers can make you look bulky. Stick with simple shapes.

Dress in all one color

You've probably heard that wearing all black makes you seem more slender, but--surprise!--going head to toe in any dark hue like chocolate, navy, or charcoal achieves the same streamlined effect.

Keep pant hems long

Tailor your trousers so they're no shorter than half an inch from the floor. A straight-leg cut gives the appearance of a lean, never-ending leg.

Put on heels with pants

They'll make you stand straighter while lifting your butt and elongating your legs. To create a seamless silhouette, opt for a pointed toe and match the shade of the shoe and pants as close as possible. This draws the eye from the point of the toe to the torso.

Wear vertical lines

They lengthen your figure because the eye naturally follows the pattern, making you look taller and thinner. But don't overdo it. Varying widths and colors can be distracting, not slimming. Best bets: Try a turtleneck under a striped dress in a basic shape, or pin-striped pants paired with a blouse in a solid color.

Accessorize with long necklaces

Bold or layered chains that fall from mid-chest to your waist pull the eye downward, making you appear trimmer.

Hem your skirt to the perfect length

It should fall just above or just below your knee, emphasizing the area between your thigh and calf. Mid-thigh skirts draw attention to the thickest part of your leg, while ultra-long skirts can look frumpy.

Choose clothes that fit just right

Sounds obvious, but if your self-confidence is flagging, it's easy to dress in baggy outfits that only add volume, and too-tight pieces are unforgiving of even the slightest bump. Trust us: The proper fit will automatically boost your confidence--and your style.