A Few Words About Color
Unless you're going for the "Sex and the City" look, you probably want your lingerie to be unobtrusive. So, your lingerie wardrobe should include the color basics -- a nude or flesh tone (as close to the color of your skin as possible), and black. White is no longer on the list. Why? Because a flesh-tone color is a much better "invisible" color than white, and white tends to yellow and/or gray with time.
If you wear a lot of a particular color, you'll probably want lingerie in that color as well. A black bra strap or slip peeking out of a red dress is either a fashion statement these days, and less of a mistake like white or nude can be.
Color in panties and thongs is also a good idea. Since low-rise styles can generate unexpected viewings of your panties, it's more fun to expose a colored pair rather than a white or nude one. So, by all means, select fun, lacy colorful panties if you know there's a chance they might be seen.