What is in the burqua?

This extract from The Silver Chair, by C S Lewis comes to mind.

“All the same,” said Puddleglum, “I wish we knew a bit more about her.” “I was going to ask her all about herself,” said Jill. “But how could I when you wouldn’t tell her anything about us?”
“Yes,” said Scrubb. “And why were you so stiff and unpleasant. Didn’t you like them?”
“Them?” said the wiggle. “Who’s them? I only saw one.”
“Didn’t you see the Knight?” asked Jill.
“I saw a suit of armour,” said Puddleglum. “Why didn’t he speak?”
“I expect he was shy,” said Jill. “Or perhaps he just wants to look at her and listen to her lovely voice. I’m sure I would if I was him.”
“I was wondering,” remarked Puddleglum, “what you’d really see if you lifted up the visor of that helmet and looked inside.”
“Hang it all,” said Scrubb. “Think of the shape of the armour! What could be inside it except a man?”
“How about a skeleton?” asked the Marsh-wiggle with ghastly cheerfulness. “Or perhaps,” he added as an afterthought, “nothing at all. I mean, nothing you could see. Someone invisible.”
“Really, Puddleglum,” said Jill with a shudder, “you do have the most horrible ideas. How do you think of them all?”