[Rey winces reflexively when the ringing becomes unbearably loud, not because it hurts her ears, but it makes the entire situation so much more mortifying when he's this utterly confused. It's not a good joke by any means, but it's downright horrid to explain it.

He does eventually get what it is, at least. She finally turns her head when he stands and lets the cape fall to its full length, curiosity about her estimated measurements for the moment overriding her shame. And despite herself, she does allow herself a bit of pride in how well it seems the thing will fit him. Not bad at all, considering she was basing all the tailor's measurements off of her own recollection of Kylo's stature and build.

Unfortunately, nothing good can last today, and the reality of the situation crashes down on her with his question. Rey glances up at his face in utter dismay and mumbles out a lame explanation.]

I found the picture in a book. The prince in the story—I thought he looked a bit like you, when I saw it. [She neglects to mention how funny she found that at the time. Doesn't seem like a good thing to bring up.]

Then I saw the cape in a shop and... [She assumes he can figure out the rest and gestures helplessly at the cloak.] It's not clever.