Here are five suggestions for getting her something for her, not something for you...

Kick It Up A Notch

Women tend to enjoy items for special occasions that they may not buy themselves. If she usually wears a T-shirt and flannel pajamas to bed, take it one step further to a baby doll or a more daring choice. Try to make it special and fun and slightly sexier than the usual.
Underwear Individuality

Base the lingerie on her personality. If she's daring and assertive, go for the novelty lingerie. If she's the reserved type, she'd probably prefer something more subtle. Either way, you can't go wrong with the most flattering underwear; lacy boy-shorts.
Size Matters

Don't go into the store and measure up the sales associate to determine your wife or girlfriend's size ("Umm, she's about your size"). Do some investigative work. Open up her underwear drawer and check out the sizes before you go shopping. Also, peek in her closet to find out her dress, blouse, and pant sizes, so you can at least narrow it down to small, medium, or large.
How Big Are They Anyway?

If you've ever wanted to know how women determine the 36 in 36-26-38, here's the gist. She measures her chest diameter, just below her breasts. Add 5 to this number to get a number usually between 32-40 (the band size). To get cup size, she measures the diameter of her chest directly over her nipples. The difference between these two numbers determines cup size. (For every inch, you go up a size, so to be a D-cup the difference between the two numbers would be 3 1/2 to 4 1/2 inches.)
Underneath It All

Buy her classy lingerie that she can wear under her clothes. "Women prefer something that's sexy but can be worn on a daily basis. A lot of women like to feel sexy during the day, by wearing something under their clothing that can crossover from day wear into night. Even when she's at work, it will make her feel sexy to know she's wearing something special underneath. You can know that she'll be thinking about the man who bought her that something special, all day long.
tights and paNTYHOSE NOT ONLY ARE COMFORTABLE but nice and warm too.
the only panties i do like though are made of microfiber or cotton soandax