Inspired by this thread, I ordered one of these. Let’s see what it’s like when (if?) it arrives!
https://dpretro.com/product/brighton-1980-83-home-shirt/
I heard the thing about the advertising too. And adidas supplied very similar shirts to other clubs at the time, I don’t recall any teams with adidas kits then playing in stripes then but I’m sure someone somewhere will prove me wrong on that.
They also only had shorts at least 2 sizes too...