Nice - happy, inebriated Sean!
I've seen that outfit before . . . Sable, remember the pic (I believe it was either a premiere or some sort of fashiony award show)? He was wearing a stripey shirt with a black, silk look (or silk) jacket. No buttons, collarless.
Do you suppose he is like the rest of us and has a 'fat' wardrobe that he delves into when the need arises? Fat being entirely relative to his usually very lean frame, of course!