James Gunn spoke about how the personalities of Superman and Batman influence their suits during an interaction with David Corenswet in the behind-the-scenes documentary, Adventures in the Making of Superman.

James Gunn unveils all: from why Superman needs his red trunks to how Batman's costume is another one of his tools for intimidation.

Director James Gunn took thoughtful measures to make sure that his Superman movie was bright and colorful, and his leading man was a person who civilians could look to as a kind hero that they would want to be friends with.