Starting in the early 60s, Brooks was also designing costumes for the theater, television, and the movies. He was nominated for the Oscar for Best Costume Design for Star! (1968), Darling Lili (1970), and The Cardinal (1963). His own clothing lines were heavily influenced by his work in the theater, and were often very dramatic. In the 70s and 80s, Brooks designed under several licensing agreements, and in 1986 he started a new evening wear line. In 1990, he went to work for Ann Taylor as a consultant.