The new uniform is fairly accurate to what is portrayed in the comic books. Jeremy Renner isn't the only one getting a new uniform in Avengers: Age of Ultron. Captain America and Iron Man will also get new costumes. As you may know, Tony Stark destroyed his arsenal of Iron Man suits in Iron Man 3. He will be getting two new suits of armor, including the Hulkbuster, which we'll be seeing on screen for the first time.
Chris Evans confirmed at the Captain America: The Winter Soldier press junket that Steve Rogers will also be getting a new uniform, including a World War II jacket, which may be seen in a flashback.
Avengers: Age of Ultron comes to theaters May 1st, 2015 and stars Aaron Taylor-Johnson, Scarlett Johansson, Robert Downey Jr., Elizabeth Olsen, Chris Hemsworth, Chris Evans, Cobie Smulders, Jeremy Renner. The film is directed by Joss Whedon.