New logline for the movie:
My impression is they're going about it subtly, so this could just be a rebooted version of Barry who doesn't remember the past timelines because of the two Flashpoints.Barry Allen’s relaxing trip to Metropolis is about to go sideways. While speeding off to help in an impromptu battle, The Flash blazes and rips through time, only to find himself dropped into the middle of World War II. It’s here that The Flash meets Wonder Woman and her top secret team, known as the Justice Society of America. Witness the raging tides of war, gripping combat and the velocity of valor as The Flash fights to get back to his own timeline!
Other than the chinstrap, which I agree doesn't look great here, it looks like a pretty basic Flash costume.
I could see them viewing Tim Sales' artwork as being too difficult to properly adapt into animation.God I hope not. For actual adaptations, I want something more inspired by the actual comics being adapted.