Shut it, eiderdown.
A giant furry body suit was the costume, with padded floppy feet and furry-gloved hands. The hidden, central zip zipped up the furry suit from crotch to chin of the furry hood. The collapsible teddy-ears were now collapsed and the matching gorilla mask pulled over.
It's showtime. Mask-eyed vision and a couple deep breaths through the mouth-slit, telegram in one furry hand and ripe banana in t'other, our intrepid courier was prepared. He spied the unsuspecting bride-to-be through the dancing crowd and stepped onto the dancefloor, bounding gorilla-like and whooping and howling and fist-battering his chest...when suddenly...