It's a Transformer. I'm so out of touch.
And secondly, once I figured out who (or is it what?) Optimus Prime is, there was no way I was attempting to create that costume. So we went shopping. Easy peasy.
Here's Optimus. (We're on a first-name basis now.)
He's smiling under that mask, I swear.
It was a rainy night so Optimus wore his raincoat to go trick-or-treating. He's such a good little Transformer.