In the story inside, it was red. In today’s climate, a lot of people make fun of that story, but it was actually pretty good. In comparison to most 1950s Batman stories, the logic held together (more or less):
Gotham is puzzled when, over a period of days, Batman has appeared in public in different-colored versions of his famous costume: red one day, sky blue the next, then green, orange, gold, etc. Is it some kind of code? Has he gone insane?
The reason: while walking home from school one day, Dick Grayson was at the scene of a robbery. A little girl crossing the street was almost run over by the speeding getaway car, but Dick managed to save her, injuring his arm in the process. His act of heroism made all the newspapers.
One of the items that was stolen in the robbery was a portable video camera. Batman deduced that the crooks planned to use the camera to pose as a TV crew at some upcoming media event. (Remember, this was the mid-1950s. What use would a video camera be to a private citizen? :eek:) Robin got a good look at the crooks, and would be able to identify them.
So Batman needed to attend every media event over the next few days to look for the crooks. He needed Robin along to identify them. But if any news photographers got a shot of Robin with his arm in a sling, someone might connect it to the story of Dick Grayson’s injured arm and put two and two together. So Batman had to do something totally outrageous to make sure that all cameras would be on him instead of Robin. Thus, the multicolored costumes, while Robin kept his sling hidden under his cape.
After a week, Robin spotted one of the crooks at a gem show, but not disguised as a cameraman. Batman apprehended him and found a gas mask in his coat. He then realized the real reason that the camera was stolen. It was rigged with a gas canister, and swapped with a camera belonging to an actual TV crew. When it was switched on, it would have gassed everyone in the room while the crooks walked out with the gems. Batman, in a rainbow-striped uniform, caught the rest of the gang, then a reporter cornered him and asked the reason behind his outfits. He refused to comment, other than to say that this would be the last one – and that he was happy to go from being a peacock back to being a bat.