I’m sorry, unbutton the Hawaiian shirt and then take off the t-shirt? Maybe that sort of removal process is logical in real life, but for a movie like Once Upon a Time in Hollywood, with Brad Pitt just one of its many notable stars, you need to streamline the taking off of one’s shirts. Pitt’s an expert in this area, and while it’s not in his comfort zone when it isn’t professionally-related, once he’s in front of the cameras, he’s quite experienced with going shirtless in a snap.
Article source: https://www.cinemablend.com/news/2493791/that-time-brad-pitt-sassed-quentin-tarantino-over-shirtless-once-upon-a-time-in-hollywood-scene