Snyder also wanted it be more "alien"-like, as if it actually came from Krypton and that is what those weird new designs are including the chainmail-like texture. I believe the OG costume was out of the question from the beginning.
Wilkinson explained that since they created a “neo-medieval” back story for Krypton (which included the creation of a new language), it made sense to utilize the suit design as part of the mythology. “Everyone on Krypton wears this suit,” he suggested. Using ZBrush and rapid prototyping, Wilkinson came up the blue/gray color and chainmail look. “It has function and purpose and a logic to this fantastical world,” he added.
We love the idea that Snyder is starting from the ground up with this movie and in a recent interview Snyder himself said this is the most realistic movie he’s made..
At the end, just like SpiderMans costume in the ASM, it'll likely look much better in action.
I don't think this will age quick though, it's different enough w/o going too modern. It actually has somewhat a classic look with the medieval inspiration and design.