At the end of The Flash - 2x01 - The Man Who Saved Central City, Cisco shows Barry the newly modified suit - based on the design they saw in Gideon's newspaper projection - prominently featuring the classic white background:
In the Trailer for Legends of Tomorrow however, he wears the old one again:
Same goes for Oliver, who recieves his (also Cisco-designed) new suit near the end of Arrow - 4x01 - Green Arrow:
Has there been any word from anyone involved in the production as to the reason?
PS: It could of course be a "simple" continuity error based on the fact they shot the footage for the Legends trailer before shooting on Season 2 of The Flash / Season 4 of Arrow even began - although it would be a rather glaring one. Legends of Tomorrow also has a time travel component, so that could obviously be a factor as well, or maybe there will be reshoots.