Paul Mescal, the actor who rose to fame after his role in the BBC’s adaptation of Normal People, loves wearing vests. He wears them to the shops, he wears them to star in musicals and he wears them to dance around hotel rooms for the Rolling Stones’ music videos. He even wore one vest on top of another vest on top of a smart white shirt in the Financial Times. Most recently, he wore one under a double-breasted duck-egg blue jacket on the red carpet. He is, officially, first in line to the singlet throne.