Are Bitex-Brille (sunglasses) real or did they make them up for the short story

So I don’t know if anyone here would know (but I don’t know anywhere else to ask but in this German short story Bin ich schön the narrator wants the cool sunglasses. But every attempt to google these just ends up at a page about the short story.

Unless that spelling is incorrect, they’ve gotta be invented for the story.

At this point, there’s nothing Google can’t find. Even checking Google, GIS, and Bing, I found nothing that wasn’t a reference to the story.

Brille just means glasses in German.

yeah but what’s Bitex