In Justice League, the Flash is wearing a very different sort of costume. It's one he's clearly made himself and while many fans suspect that Batman will provide him with an upgrade by the time all is said and done, we now know that Barry Allen won't be getting his costume from the Speed Force.
In the comic books, Barry got his suit from within a ring and has frequently used the Speed Force to change the molecules of whatever he's wearing into his Flash costume. That's not happening here!
"Well, you know, look, I can confirm, spoiler alert, his suit does not pop out of his ring [in the movie]. Things have to progress, you know? Original Barry Allen was clearly an incredibly, incredibly clever scientist. We acknowledge and respect that. We want to apologize to the fans who are mad about the ring thing." Not even The CW series has gone down this route, though Reverse-Flash had a ring!
"I know the ring is the coolest thing about the DC universe," he adds. "It was a little hard for us to sell in this version of this universe right now. Bear with us! There’s gonna be other cool things." What those will be remain to be seen but with Flashpoint also on the way and Batman v Superman: Dawn of Justice teasing time-travel, this version of the Scarlet Speedster could indeed be the coolest to date.