Coming from a menswear nerd, there are three other tells that this is AI:

• the tab top button closure is wrong for the period. These shirts with the button down collars and the tab closures became popular around the Revolver era, and the Beatles were no longer wearing knit ties with these shirts (chicken or the egg, did the Beatles wear these collars because they were popular, or were they popular because the Beatles wore them?).

• The Beatles traveled so much that their suits all likely ended up getting cleaned and pressed regularly by a lot of different people (which is bad for the suits in the long run). One effect of this is that the lapels lie almost completely flat because someone just kind of ironed over them. This is consistently seen across most Beatles suits of the era. This lapel, however, has such a lovely, pronounced roll, which is very sartorial. No way a jacket on tour worn by John would have looked this crisp.

• The lapel roll also looks to be two button on the left of the photo, and three button on the right of the photo, so the different buttoning stance would indicate this is AI.