I listed a swatch book from the 1920s in the Etsy shop. It has swatches of Spungola. The only thing it says as far as detail is “36 inches wide”, which must refer to the width of the fabric. Since I found it with some other 1920’s swatch books, I’m presuming that this one is also 20s.
I’d never heard of Spungola, so I went looking. I found that it was British-made “washing silk” and was advertised as being new in 1910. Here’s an ad:
Ads mentioned using it for blouses, lingerie and coat linings. It was manufactured in prints and solids. It seems it was quite versatile, but you don’t see many US ads for it and when you do, it is generally advertised for making slips. It was more commonly advertised in the United Kingdom, and there, the ads gave the more varied uses . By 1930, ads disappeared and Spungola seems to have disappeared from the scene altogether.