I think you could do Affleck's hairstyle with a piece, certainly for a one-off occasion, provided you had your own full time hair stylist. Of course it is fantastic work if it is a piece, but Affleck may consider it worthwhile to take that trouble, to quash the rumour that he wears.

There is no doubt in my mind that Affleck has worn a piece in the past - some of his units were fairly obvious. I am not sure how he could have got his front hair back so luxuriantly other than with a piece. But who knows.