I came across a reference to "Angola yarn" today.
Tales of the Living Age. 1858
Eddies Round the Rectory. by Owen Varra (fiction)
"Don't you remember the day Miss Cooper advised home-knit Angola stockings as the best for winter wear, and you gave a laughing glance at me?"
Interesting the writer used this wool in home knitting, which means this type of wool/yarn is available for purchase for hand knitting. This yarn seems to only show up for use in stockings. I love when I discover new information and I'm not looking for it. I'm usually on a different quest. Go figure!