Isaac Newton (actually not Newton) visited by time traveller who has confusion about human anatomy

Question

I’m looking for a story I read about 1992 in an anthology; a time traveler/alien, visits Isaac Newton, to find out about Newton’s life.

The visitor is disguised as a woman dressed in period garb, but is unaware of what humans look underneath our clothing.

When circumstances lead the visitor to disrobe, it is shaped like the corsetting underneath, leading Newton to freak out and to choose to never marry.

Answer 1

This is "A Shape in Time" by Anthony Boucher.

It ends

"No, don't change back. Leave it that way. I'm curious as to the effects of -what was the word they used for it in 1880 - of a woman's bustle."

Not Newton though. Edwin Sullivan.

Hat tip to user Occam Shave who commented that the story is available to read on the Internet Archive here.