When it comes to costumes in superheroes, honestly i think that Wonder Woman's costumes is one of the hardest one to portray in DC Movies. You do not want to her to be practical but also sexy at the same time to make a good Live Action Costume. Here are some costumes i think DC should take inspiration from in their upcoming film
The Justice League War Version:
As i got to admit i am one of the few people i know that really likes this costume. Sure it is very different from the Classic Wonder Woman Costume. It is practical but also looks very good. While i don't think they are going with this version ( My guess is that they will go something similar to the New 52 Version)
Wonder Woman/Ms Marvel Mashup:
Man is this a great idea for the costume. It not only contains the right amount of sexiness and practicality and i really could see in the live action version.
The New 52 Version:
Honestly i think that the New 52 Version is good but not great. However i do think that it is the most likely version for them to base on in the Batman vs Superman Movie and the Wonder Woman Movie. While i do think it may be too sexy and distracting for Movie Audiences.
The FlashPoint Version:
This is the most bad-ass version honestly. But honestly i think that they are going to use this version for the Amazon Female Generals. The Flashpoint Version is still very cool though and i would love to see Wonder Woman use the Flashpoint version costume at least once in the Wonder Woman Movie.
Here is a Non Wonder Woman costume which would love to see Zack Synder take at least some inspiration from ( Even though it won't happen). Pyrrha's costume for the Web Series RWBY. It is Sexy but also rather practical. If they just change the colours a bit i could see something similar for the Wonder Woman Movie.
and