1970's MEGO ORG RC BATMAN / BRUCE WAYNE W/ VINYL CAPE - eBay (item 300301519360 end time Mar-25-09 1734 PDT)
I got a little excited till I started looking at the cape a little better. I have no vinyl cape to reference it with, but looks like the whole thing was hand cut. I'm pretty sure in picture #3, I can see where the pattern was drawn on the scallops.
Plus, this cape never came with RC Batman that I know of.