Ben Affleck's Batman suit in Batman v Superman: Dawn of Justice is quite different when compared with the others we've seen in the past, especially that of one used in Nolan's Dark Knight trilogy. We understand it takes Affleck 25 minutes to get into the suit, with the help of three assistants.
According to Batsuit designer Michael Wilkinson, the suit is complex mainly due to the fact that Zack Snyder wants Affleck to be able to turn his head. If one remembers correctly, Christian Bale was not able to turn his head in his Batsuit, and it clearly shows. The same can be said for other actors who wore the cape and cowl before him.
"That's actually one of the first things that Snyder mentioned to me in one of our initial meetings," Wilkinson says. "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. So a lot of incredible engineering went into the development of the new black cowl."