Invest in your work wardrobe. Chances are, you are done with school and working a real 9 to 5, so your style choices need to reflect that transition. Stylish but professional dress in your late 20s consists of simple separates, like neutral-toned slacks (think black or navy) with bright button-down tops (red, pink or jewel-toned blue), and shows your youthful personality (lizard or croc pumps). You don't want to look older than you are, so it's acceptable to spice it up with a colorful print scarf or a funky pair of earrings.
Infuse color and comfort into your casual wardrobe. When you are a bit younger, perhaps you ran errands in shorts so short, you could see your....ahem...curvatures. Or perhaps you were given to wearing tank tops to do just about anything or graphic tees with witty sayings. However, in your late 20s, you've grown up quite a bit. Dress with more flair and class for casual errands. Think denim capris, espadrilles and a tunic tank, or a simple sundress with wedge sandals and a fabulous straw hat. You may be prone to covering up a bit more in your late 20s because you now realize sex appeal comes from the way a garment fits, the way it flatters your shape and the manner in which you accessorize it and not how much skin you can show.
Show your ladylike side at night. When you are headed out for drinks with your honey or dancing with your pals, go sexy and sophisticated -- late 20s style. Dark-washed skinnies, a halter top and sky-high heels are so much more hot than, say, that combo with a barely there miniskirt. Less is more when it comes to after-hours style and ladies in their late 20s know it.