Drew Brees -- DRESSES UP IN COSTUME ... to See 'Noah' Movie

Drew Brees and his wife saw the "Noah" movie the other day ... IN COSTUME ... two by two.

The New Orleans Saints QB and his wife went to a screening of the new Russell Crowe flick by their home in San Diego ... wearing full bible regalia.

Brees -- known as one of the religious guys in the league -- even had a tin foil ax for good measure.

After the movie, Brees tweeted about the experience ... saying, "Saw @NoahMovie the other night at Cinepolis. Opens 3/28. Very intense! #thefloodiscoming."

We get the hashtag is for the movie, but weird since he's so strongly connected to the rebuilding of N.O. after the Katrina floods.