Have you tried vintage clothing shops? Might be a way to get ideas, if not the dress itself. My favorite brand without a doubt was ESPRIT -- they were very popular in the 80s. I used to rip pictures out of their mailings and put them on my bedroom walls.
You could also shop ebay for 80s era sewing patterns.
Are you looking for some dressy or casual? I can remember one of my favorite looks in HS being a black spandex mini skirt and black pumps with a solid, but brightly colored mock turtleneck. BIG earrings were mandatory with almost everything. That was my "chic" look.