You don't have to wear black everyday to look your sleekest. Try these simple figure flattering tips to elongate your body.

Here's How:
   1. Opt for a monochromatic outfit.
   2. Add contrast color or texture with a blazer, cardigan or overshirt.
   3. Leave the blazer or cardigan unbuttoned for maximum vertical lines.
   4. Any stripes on the garment should be vertical.
   5. Choose scarves tied loosely with long, vertical dangling ends.
   6. Match pantyhose hue to skirt or pant and shoe color.
   7. Avoid big belts, which can cut you in half visually.
   8. Use long necklaces or pendants and avoid chokers.
   9. Wear skirts that are longer than they are wide.
  10. Choose shoes with at least an inch heel: the taller the better.
  11. Elongate the neck with V-necks.
  12. Wear a shorter top with long & tight fitted pants.
  13. Wear a long top with shorts/short skirt.

Tips:
- Monochromatic doesn't have to mean boring. Mix textures to keep the look interesting (i.e. knits with leather)
- If you are petite (5'3" or under) make sure you scale everything down : smaller prints, pockets, etc. so they don't overpower your figure.
- Don't make the mistake of going for all the long pieces. Go for contrasting proportions. Mix a longer jacket with a shorter skirt, shorter jacket with pants, etc.

References:
about; shopaholic-area

Here are a few tips to show yourself off to the best advantage.

What you should look out for:

1. Do wear fitted clothes - they will look great on you!
2. Do show off those lovely legs in a short dress or skirt, and it will make your body appear longer.
3. Do wear slingback shoes with killer heels, they are made for you, showing off the full length of your leg and making you appear taller.
4. Do stick to skinny trousers and skinny jeans, anything wide will shorten you.
5. Do nip in your waist with a wide belt.
6. Do wear tops and dresses with horizontal stripes, they will give the impression of gorgeous curves.
7. Do pick cropped jackets they won’t swamp you.
8. Do wear light knits, but avoid chunky pieces, they will swamp you.
9. Do choose well fitted pencil dresses, they add shape and definition to a small frame, its the perfect dress for a night out.

References:
fashion-style

Every woman has something about her body she'd like to hide, whether it's heavy thighs, a pudgy tummy or a too-round bottom. With just a few visual tricks, your problem areas will disappear and let your true beauty shine through!

Bottom-heavy
If your hips are wider than your shoulders and your thighs are round, you have a classic pear-shaped body. Dressing is a snap if you remember to accentuate the positives: a shapely waist, delicate upper body and attractive shoulders and arms.

For Tops
1. Avoid too-baggy tops or too-tight tops: the looser tops will make you look large all over, the tight tops will make you look out of proportion to your hips. Look for fitted -- not skintight -- T-shirts (something with some stretch) and button-front tops. V-necks, turtlenecks and open collars all call attention to the face, which is always a good thing.
2. Jackets and blazers should hit anywhere but the widest point of your hips. That could mean right below the waist to mid-thigh, depending on your height. Wear jackets and blazers open for the best vertical lines.

For Bottoms (e.g. shorts/skirts)
1. Avoid anything too tight.
2. A-line skirts that hit around the knee area are ideal because they draw attention away from problem areas. Miniskirts are generally a bad idea because they accentuate heavy thighs.
3. Pant waists should fall somewhere below the natural waistline for a better fit. A straight or slightly bootcut leg is the most flattering. Avoid patterned or light-colored pants. Skip fussy details like big cargo pockets, rouching or excessive zippers around the hip area.
4. Shorts can be tricky, but for workouts and casual wear, choose lightweight, loose-fitting shorts (no bike shorts). Slimming side stripes on shorts can give the illusion of sleekness.

For Dresses
1. Look for dresses that nip in at the waist and slightly flare out over hips and thighs.
2. You can pull off a full-skirted ballgown because it will hide heavy hips and thighs.
3. Try sleeveless and strapless dresses to play up pretty shoulders and arms.
4. An empire, or raised waist dress brings the eye up away from problem areas. Careful, though. Sometimes this gets mistaken for a maternity look with fuller figures.

Top-heavy
The apple-shaped body is usually softer around the middle and has heavier breasts, with narrower hips and slimmer legs. Make the most of your womanly figure by showing off your legs and great cleavage.

For Tops
1. Avoid too tight (plays up large breasts too much) and too baggy (just makes you look heavier). Opt for fabrics that skim the body, preferably knits and wovens with stretch for a better fit.
2. V-neck, boatneck, turtle and mock necks and shirt collars are your most flattering necklines.
3. Play up nice cleavage with a peek, not a Dolly Parton-sized slice. Especially appealing: a pretty lace-trimmed cami showing under a jacket or top.
4. Avoid full sleeves or puffy sleeves.

For Bottoms
1. Balance out a top-heavy figure with an A-line skirt that will give you the look of a waist and more of an hourglass look.
2. Choose flat-front, never pleated, pants that have a lower rise than the natural waist.
3. Five-pocket jeans are your friend! Front pockets on jeans help disguise a tummy problem, while back pockets can help define a flatter rear common to top-heavy women.
4. Avoid anything too tight -- from pencil skirts to skintight jeans -- because it will only accentuate top heaviness.
5. Play up nice legs with shorter (an inch above the knee) skirts.

For Dresses
1. One-piece dressing is tricky for you. Best bets: A sleeveless black sheath, a soft princess seamed dress, a strapless dress with corseted top.
2. Resist the urge to cover up head-to-toe: showing a little skin, whether it's bare arms or shoulders, is much more flattering.

Body basics for every figure
    > Wear colors that look great on you. Not sure what those are? Grab a trusted friend and head to the mall. Hold up tons of colors next to your face and get feedback from your friend. Hues that compliment most complexions: pink, blue, white (you'll just need to change the intensity of these colors to suit your coloring, i.e. hot pink for darker skins, carnation for fairer, ivory for olive tones, etc.)
    > Nobody looks good in high-waisted, pleated pants with narrow ankle openings, but manufacturers still turn these out in droves. Avoid!
    > Don't worry about being trendy when you look at what suits your figure: concentrate on what flatters, and add up-to-date shoes, handbags and accessories later.

References:
about.com