This fabric treatment is a lot like scoring paper to get the right folds. However, in this particular design, the use of "scoring" is not to create a fold line but to make a design detail in an otherwise plain fabric.
gif of Benedict Cumberbatch dancing (or flailing...) WARNING: Do not watch this is you've just taken a drink of something, I almost spit water all over my computer screen when I watched this. Is this seriously him??