Somebody emailed me last night asking me what a cambric shirt was. Of course, I knew right away that the person in question was listening to Scarborough Fair, and I wondered why I'd never bothered to look that up, even though that song was a lullaby staple at my house for years.
According to dictionary.com, cambric is "a thin, plain cotton or linen fabric of fine close weave, usually white." And here's an interesting article at Wikipedia about the origins of the song.