I was an avid follower of the television show Tim Gunn's Guide To Style. He has this list of ten must-have in every woman's wardrobe. The Ten Wardrobe Elements are mostly classic pieces that fits you properly, are not outdated, and bring out your best features. First on the list is the basic black dress.
Basic Black Dress - The basic black dress has been around for a long time. It is often called the "Little Black Dress", and it's true that shorter skirts on the basic black dress, when they hit you in the right place, can be more flattering than a long black dress. ~suite101.com
I haven't found the perfect black dress for me, yet. But one of these days, I'll find "the one". You should look for yours too.