There are a few things about these photos that make me laugh.
1)The suit looks like it is made out of rubber. If they go down that road I think tights look less silly.
2)it looks like the suit is being used to try and hind the fact that Afleck has a tiny gut and isn't as muscle bound as they want him to be. I know how out of shape I am but then again I am not trying to play Batman. Here is a tip if you get cast as Batman and you want me to believe you would last more then a second in a fight with Superman...HIT THE GYM!
3)The way the buttchin looks like it is being squeezed out of the cowl under pressure. It's just looks silly to me,sorry.