Evidence 1:
After we posted this picture last week our eagle eyed reader Jeannine started to think where she knew it from and remembered it's RobArt's t-shirt from How To Be!
From the condition of the t-shirt I'm going to say it's RobArt wearing Robert Pattinson's t-shirt, not vice versa :)
Evidence 2:
This video is from Harry Potter Goblet of Fire (2005) promotions and he is wearing the sweatshirt that he also wears in How To Be (2008). How To Be was a low budget movie and it's endearing that the actors wore their own clothes :)
From How to Be

How To Be screencaps from Robert Pattinson Source
Order How To Be: