I can’t imagine that Sheldon is such a superfan of the show but hasn’t ever bought an official Professor Proton lab coat over the years.
However, we’re pretty sure that the real Professor Proton (R.I.P.) would give Sheldon’s duds a suspicious eye for a couple of reasons.
With as many superhero T-shirts as this guy has, it’s unlikely he would have gone all his adult life without nabbing at least a Proton Halloween costume.
First, he’s just wearing a straight-up white lab coat, without the proton symbol on the front.