Yves Saint Laurent Menswear Top Size L (I think)

70% Rayon 15% Linen 15% Ramie Designer Top, missing size label. Measurements: Chest: 48" shoulder: 40" Length: 31" My best guess is that it is vintage. It came out of my grandpas closet. I was unable to find anything else like it with a few google search. Original price based on current shirts that look like it.