I don't know how accurate they are to the original costumes, but I gotta get the Megatron one.
YEARS ago, for Darkchristmas (Halloween) my brother wore the plastic mask and vinyl smock of Megatron, and Mom ties my old Star Wars Han Solo blaster to his right arm.
(I was Cy-Kill. Had to, I was the little brother. And Mom made cardboard wheels for my shoulders.)
If the costume isn't accurate, then the bare arms aren't. My brother wore a sweatshirt, both because it was October and to keep the lashes from digging into his arm.
Now I'm gonna need them to make a Cy-Kill.