That is right, Brie Larson’s green suit is now official as Marvel has inserted it into a page of Infinity Countdown: Captain Marvel (2018) #1.
Look at the interior page taken from Infinity Countdown: Captain Marvel #1 showing the suit:
Brie Larson in costume:
Carol Danvers has crossed the borders of reality itself and returned in possession of the Reality Stone…and with it has contacted the Marvels of many worlds! Join the Captains Marvel for a cross-time adventure into the nature of the Infinity Stones!