While Clint Barton has been part of the Thor, Hawkeye went on to become one of the original Avengers and has been a core MCU player ever since. While the Marvel archer was mostly a ing player, Disney+ is finally giving Clint his own series that will put Jeremey Renner's character in the spotlight. But the Marvel Studios original is also adding Hailee Steinfeld, who will bring Kate Bishop to life in the series. As the show will draw more inspiration from Hawkeye's comics, Clint is finally going to don a more traditional costume. Despite having existed in the MCU for over a decade, it only makes sense now for Hawkeye to shift into a superhero uniform.
When we first meet Clint, he is a Avengers: Infinity War, Clint ditched the Hawkeye identity to became Ronin, a far more violent vigilante, leading him to make more enemies globally than ever. That's why his new look in Hawkeye is a way for Clint to start building a secret identity, something he didn't really have in the other films. While the set photos haven't revealed if Hawkeye is concealing his identity with a mask, it might benefit the archer to add that to his disguise. The H-shaped cowl will always be a huge debate whether or not it would visually work in live-action. But nevertheless, a mask of any form will be necessary for Hawkeye, post-Avengers: Endgame.
Hawkeye is a new chapter for Clint in multiple ways, including taking Kate under his wing before ing on the mantle to her. Clint has never had to worry about his identity, mostly because he had retired before the events of Thanos, Clint has a bigger need for an alter ego. Ronin was a dark phase, and, while that phase is now over, Clint shifting over into a more traditional Hawkeye costume helps symbolize him going back to a better life, but in a new capacity.
Clint donning a more comic-accurate costume is also fitting due to the direction of the Disney+ shows. Since Hawkeye's purple, comic-accurate suit from page to screen in Hawkeye.
Even though it's not clear currently if Hawkeye will incorporate the cowl, it wouldn't be a surprise if they did adapt it somehow. If WandaVision was able to adapt Scarlet Witch's crown, then there is no reason why the H-shaped cowl couldn't have a similar approach. It wouldn't come as a big shock if somehow the Hawkeye finale is where they have Clint disguise himself with some form of mask. So far, the finales for the Marvel Disney+ shows is when the biggest surprises usually happen, which could be what Hawkeye does too, to complete Clint Barton's comic accurate uniform.