Prom styles looked this in the 70s. This picture of a typical 1970s girl in her prom dress waiting for her date shows the retro style. Her dress shows the style that followed the Gunny Sax which was popular in the mid 70s. At that time we were happy to see the Gunny Sax leave the scene. The styles became a little more sexy and form fitting by the end of that decade.
The hairstyle shown here is typical for that time: feathered back and parted with a very straight part.