Seinfeld Cosmo Kramer Lobster Button-Up White Shirt

How can this shirt be 100 percent cotton, 35 percent rayon and 65 percent polyester all at the same time? r?

I want to get this for my brother, he is 5'9 160lbs, he's a pretty fit/slim guy. Would a large fit?

Does anybody have the dimensions for this shirt? i'm 5'10" 160 lbs. and i am thinking of getting the large, but i have no clue. shirt chest width?

Where is this shirt made?