A man in a pinstriped suit walks down the street and does n't notice the quirky poster on his left.
The man who just purchased a pinstriped suit for a formal dinner didn't notice the poster to his left that shows a man wearing the same suit.
Just because the man has on a pinstriped suit does not mean he just purchased it or that it was for a formal dinner.  Just because the poster is quirky does not mean it had a man wearing the same suit on it.
A man in a pinstriped suit walks down the street and doesn't notice the quirky poster on his left doesn't imply the man just purchased a pinstriped suit for a formal dinner and the poster is not necessarily of a man wearing the same suit.
You can not infer the suit was for a formal dinner.