It's not that Ray hasn't seen the outfit before, you understand. It's just that last time he saw it, he was in the Animated Continuum, and Venkman's father was wearing it. And now he's wearing it.

And there are completely unrecognizable people- kids, practically- running around with proton packs like he hasn't seen in a decade or more.

And he's almost certain that he's supposed to be at the car dealership about now....