Read interviews with some of the top costume designers in the movie industry today:

Interview with Costume Designer Janelle Nicole Carothers (The Perfect Match):
Interview with Costume Designer Janelle Nicole Carothers (The Perfect Match)

From Janelle: I usually get brought on about 1 month before depending on the scale of the production. Sometimes as late as two weeks. I collaborate with the Production Designer. I report to my directors and producers. The wardrobe budget is given to me and I review the script along with the budget and see what the script requires and if it can be done on the budget I was given.

Interview with Costume Designer Linda Muir (The Witch, Bitten):
Interview with Costume Designer Linda Muir (The Witch, Bitten)

From Linda: Research is my thing. I do thorough research to inform my designs. In preparing to design costumes for The Witch I read approx. 1,800 pages of material…