In searching the Internet, trying to answer your question, I came across several books that might be useful. It seems that there are resources written just for performing arts and costuming professionals, which would be helpful for your film project. One such book is the "Fashion Sourcebook" series by John Peacock. There a volumes devoted to each decade from 1920-1990.
Here's a link to the 1920's edition: http://www.amazon.com/exec/obidos/se...037665-0816157