You should start with selecting your hair style, but if you find a picture somewhere of a whole look (dress and hair) that you like, then you could select the dress and hair at the same time.
Below are some more examples of hair styles that will work for the prom. Keep in mind the type of dress that you will be wearing. If your dress is very busy, you would want to go with a simpler hair style, and vice versa if your dress is simple, you could go with a fancy updo hair style.
Uma Thurman has combined a simple black dress with a fancy updo hair style.
Even though this hair style looks fancy, it is actually very easy to create. Add soft waves all over the hair and part the hair on the side.
Pull back all of the hair and twist into a chignon. Pull out a few wispy strands around the fact for added softness. Add fancy earrings, and you are finished.
Ashley also has a very easy updo hair style that has a messy, undone look to it.
The hair is kept wavy, the bangs and layers are swept across the forehead from a deep side part.
