Honestly, I feel that they made the right call. The suit, in the movie that is, was something from Krypton instead of being homemade. It looks like it was made in the struggling civilization Krypton was. In Batman v. Superman, I hope the costume becomes a bit brighter, maybe add some more yellow, but other than that, I don't think the costume needs briefs.(I'm not opposed to them, but it's not something I demand they add.) They may or may not work on screen...idk. Btw, I personally like the longer cape.
Back when Supes was first made, I'd think people would've understood the briefs.(Strongmen would wear them...) How many people would honestly know that now? Superman's suit has gone through many changes, the suits changes tons of times, the colors have changed in shades and hues. So now they decided to remove the briefs. I can get why people wouldn't like the change, they're iconic and they've always been around, but I don't think it's as bad as people think. It's a new take on Superman's costume. Things have to change eventually. If I was a hero, I wouldn't want to wear the same thing for the entirety of my career.
Though, I would say I'd like to see the Superman curl.
I don't like the briefs look honestly, it looks so 40's. The most iconic part about Superman is the shield, change the briefs isn't unnecessary because they don't make sense in this time period? They're there to add more red to the costume, I'm fine with that, but it's possible to add red w/o briefs.