Despite the fact that your descriptions are ripped off from wikipedia, I'd like to offer some suggestions in terms of practice rather than theory:
Babydoll- usually much briefer than 6" above the knee, just skimming the point there the thighs meet. They also often have an empire waist and are quite filmy or sheer. The image you're using is more of a chemise than a babydoll. Try something like this
http://us.st11.yimg.com/us.st.yimg.c..._1936_54221193
Bodystocking- In North America at least, they are not worn under clothing in cold weather. A unitard is generally used as for sporting purposes. If the garment has no legs, it is then a body suit, not a body stocking. Since they are not a popular thing to wear outside of the bedroom, they are often crotchless.
Camisole- It's more like a dressy, loose tank top meant to be worn under a blouse or jacket for modesty's sake. The image you are using is not a camisole at all. Try something like
http://scene.barenecessities.com.edg...ties/8742han1?
Learn your product! Your customers know it much more intimately than you ever will, and will spot from a mile away if you don't know what you're talking about.