If you need a 1920s-style party frock for a teen girl, this tip from Ruth Wyeth Spears describes how to whip up a lovely petal-skirted dress. Just get a few yards of crepe de chine in a lovely color and in no time you can have your girl looking chic for a summer party! The simplicity of the design amazes me - Ruth's techniques require no pattern and allow you to fit the dress to wearer. Don't be held back by the idea that this is a young girl's dress - I think it would work for any age!
As an interesting aside, girls remained girls much longer in the 1920s. Note how Ruth Wyeth Spears refers to "young girl" and "young daughter" in this sewing tip, but defines that as 16 to 18 years! Of course, back then sizes were defined in "years" as well. :)