Might be too early to discuss this, but what the hell? What kind of look would you like to see Pietro have on screen?
The Green? Indicative of his time with the Brotherhood...which they can't reference.
The Blue, more heroic and calls back to his time on the Avengers...
Or would you rather they do what they did with Hawkeye and going the Ultimates route (Clint's uniform and status as a SHILED Agent; let's just say the costume for Pietro)
I'm sure they'll tweak the suit, make it something that calls back
to the comics rather than being a direct translation; but which one of these looks do you think wold make the best template?