Neal Adams on this cover:

“You and I are going to play a game,” he said. “How many pairs of pants does Batman have on this cover?”

“Two,” I answered. “He’s wearing a pair and Ra’s al Ghul is holding a pair. But why is that?”

Adams explained: “It’s because (editor) Julie Schwartz refused to let me have bare legs on Batman. It was OK to do the bare chest, but if he had his pants off that would imply that he had taken his shorts off as well. So you couldn’t do that. So I said ‘But he’s got a costume!’ and Julie says, ‘Nobody will notice.’ And it’s true.”

At which point I pointed out Batman’s famously hairy chest.

“The hair on his chest sold more comics, I think than anything,” Adams said, only half joking, I think. “Like, ‘Batman’s got hair on his chest! I never realized!’ Yes he does!”