Steve has ripped everything that makes him recognizable as Captain America off of his suit because by making the decision to save Bucky and fight Tony he feels like he is not worthy of the Captain America uniform
Some more concept/promo art for Avengers: Infinity War has found its way online, giving us much better looks at some previously seen images of Captain America and Black Widow, and a new glimpse of Falcon.
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Where are the Infinity Stones to Start Marvel Avengers Infinity War
Avengers Infinity War Movie Poster 2018 Featuring Hulk, Iron Man, Captain America, Thor and Doctor Strange - DigitalEntertainmentReview.com