I think this has been answered but now it's official.
"Creating the new Batsuit, revealed Wilkinson, included input from Batman v Superman director Zack Snyder, who apparently wanted to address one of the problems with Batmen from previous movies: namely, the Dark Knight's inability to turn his head.
"It’s a very important thing to Zack that the Batsuit would be comfortable and very flexible but then would be able to perform in a very natural and forceful way," said Wilkinson, adding that the rigidity of the cowl and neck-pieces was "one of the first things that Snyder mentioned to me in one of our initial meetings." This time around, promised Wilkinson, "a lot of incredible engineering went into the development of the new black cowl."
https://www.yahoo.com/movies/s/ben-a...193114304.html