In the beginning of each season I would sit down with my team and we would talk about all the characters, and whatever information I had at the time we would discuss in terms of costume design. And then we would start researching. I allotted a week’s time to research and to complete the design book – in the beginning of each season I would create a design book for each character. In a total of five weeks that I get to prep the season, a week is a good amount of time. The preparation period goes really fast.
And then, throughout the season, my team and I, we are always researching. Because new characters will come into play or I’ll be thinking about something specific for one of the principal casts, and want to be able to show something specifically, visually to the team or Matthew Weiner. - Janie Bryant, Mad Men Costume Designer (x)