Though even in the context of what we’ve seen from Batman #33 (via CBR), wearing a duster in the middle of the desert does help protect the Batsuit from any unwanted damage by sandstorms or exposure to sand in general.
Superman: Dawn of Justice is a pretty sweet look for Batman.
As far as the costume itself goes, the Knightmare outfit from Batman v.
The only downside would be the fact that this must make traveling in the desert even hotter for Batman, leaving us to hope that there’s a proper ventilation system in his suit.