The below links will take you to individual posts from BTS with information, references, and resources related to costuming for film.
Wardrobe Dept. Breakdown
An in-depth look at the rolls within the Wardrobe Department, what they, are and what they do.Charts and Paperwork
For the more technical side of costuming a film, you need charts. Lots of charts. Below are an explanation of the different kinds of documents, what they are, how they work, and how to use them.