Southern Style

The Sheath Dress and Cashmere Cardigan
Nothing is prettier nor more representative of a lovely southern aesthetic than a classic sheath dress in cotton twill or cotton sateen and in silk-cotton, linen-cotton or wool-cotton fabric combinations. All are suitable to the climate of the south and they are hands-down the most flattering.
It is smart to choose a pretty, lighter-colored three-quarter sleeve cashmere cardigan to accompany a dress. Do choose a light color, as it adds light to the face and neck, and cashmere of a finer quality has a structure, as well as a softness that will not allow for bagginess. If you have a smaller waist and wider hips, a wrap cardigan is a really pretty way to emphasize those proportions.
The Oxford Shirt and Pencil Skirt
This is universally flattering. It is so easy to look pulled together and fresh. You need only follow a few tricks to suit your body type.
Choose a crisp cotton oxford shirt in a cut best suited to you. The trick for the top is to find the most flattering fit at the bust line and hip. If you are still feeling as if you look a bit untidy around the middle, a great secret is to buy maternity oxfords. You'll have a looser fit through the middle only, while still being tailored in the arms and back, and it won't be too long.
The trick for finding the most flattering skirt is zipper placement and skirt sizing. You will achieve the smoothest fit by finding a skirt with a side zip and no discernable waist band. A back zip can pull at the waist and leave a crease. A front zip just adds bulk. Many girls shy away from a pencil skirt assuming an a-line skirt to be most flattering. This is a mistake. The trick for fit is to buy a size or two up and wear the skirt a bit lower on the waist or upper hip. The extra room in the body of the skirt will just skim the hips without creating a bulky silhouette at the knees.
Again, linen-cotton and wool-cotton blends are fine choices, as these will drape from the body well.
Proper Shoe
Avoid flats and wear as much of a heel as your lifestyle will allow.
Even a one-inch heel will give the illusion of length.  Few shoes compare to Ferragamo's Vara.  It is available in a wide variety of widths, colors, and leather choices.  It is supremely comfortable, and while it is quite an investment for many, with good care the Vara will last a lifetime, and it will never go out of style.  The Vara is the most feminine, flattering, and lovely shoe.
Chino Skirts+Twin Sets+Jack Rogers
Three inch chino shorts are most flattering.  Longer shorts cut off the line of your legs and do not do a great job flattering them.
I love, love, love twin sets, and they are especially flattering if you think to buy the cardigan and shell in the best individual sizes for you, even if this means two different sizes.
If you are broad shouldered, choose slim fitting twinsets that are cut just below the natural waist.  This is such a lovely look, and it is always delightful to see pretty little twinsets. 
Jack Rogers Navaho sandals in "Bone" are so pretty with the light blues, pinks and yellows. This color is the only shade of beige (shoes) that looks right on fair skin.
A great trick to wearing them well is to have expertly buffed toenails. Shiny, perfectly buffed nails are so much prettier, and frankly harder to come by, than just covering up with nail polish. There is a quiet perfection in having beautiful feet and nails.