By comparing different sites I believe Mr Pitt is wearing Maui Jim Aviator Square Sunglasses. The first link below shows a shot from the movie and the second link shows a fake look-a-like pair of sunnies. They look close enough to be the same to me.
After some more research, I stumbled across a bit of information that stated that Brad Pitt is often seen wearing Oliver Peoples sunglasses. I have yet to find the model and suspect they may be custom frames.
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