Nylon shirts?

I have just been reading a novel by Sian Thomas (the late wife of Robert Preston the economics journalist  BBC) called An uncommon murder. She sets the atmosphere well in 1946/7, especially the grey post war with rationing. BUT at least two of the male characters are described as wearing nylon shirts.

My husband and I compared memories and could not recall nylon shirts being worn by males in our families before the 1960s. I can't find any clear information on the Web either only that there were nylon stockings of course.  Can you remember when nylon shirts became commonplace?

We enjoy reading a lot, getting through 5 or 6 books a week, and often discuss how well books are written and their accuracy!