In the version I knew in teens many years ago, two of the three [in this rendition] were clergy-daughters: Elizabeth Porter, the Bishop of Chichester's daughter; Elizabeth Humphries, daughter of the Vicar of Dumfries. The 3rd was merely Elizabeth Plender who was having some trouble with her suspender, which eventually, IIRC, got stuck in her feminine gender ~~

~~ and nobody knew they were there!

Rhymes required obvious or ascertainable further upthread

And please note, whoever made that most dubious assertion above, that Tom Lehrer, about my age, was nowhere around in those days.

♥♫❤Michael❤♫♥