* De Niro's character, Sam "Ace" Rothstein, is known for his sharp dressing style. He is a high roller in the casino world, and his suits reflect his wealth and status.
* The film emphasizes the meticulous nature of his wardrobe. There are numerous close-up shots of his suits, ties, and cufflinks, showcasing the luxurious fabrics and impeccable tailoring.
While an exact count is not available, you can certainly say that Robert De Niro wears a significant number of suits in Casino to portray the character of Sam Rothstein.