This question arises from the fact that I have listened to the audiobook for Anathem, and thus, have not read the text.
Near the end of Apert during the chapter "Plane" Erasmas describes the fashion of Slines. He says that they are enormous, wearing things descended from jerseys that are so over-sized they hang past the knees, with pants that are too short for pants but too long for shorts (thus exposing a few inches of massive calf) and dark goggles strapped over a hat.
He uses a word to describe this garment that I cannot identify. It sounds like Berneuse but I can't find anything resembling clothing attached to that word.
What is the thing he is describing?
I am sure that it is not an invented word, as many are, because he did not invent any of the other garments he describes and it would serve no purpose (would not enhance or help convey the story).