What I love most about this picture is that I can't tell which decade it is from. I'd classify this style as emo / goth, which was in style hundreds of years ago until today. As long as kids feel displaced and awkward, emo/goth style will always be in style. Whether you like a more traditional prom look or not, you can't deny that these two look completely fantastic. The layering in their outfits is something to be admired.
If I have one criticism for them it's that they might have gone a little too far with the goth look. Something tells me that girl's complexion is not usually so... white. That's a lot of powder, by my estimation. My guess is that this photo was taken some time in the 80s, when powdering yourself was cool.