Is there a name for the facemask Korekiyo wears? Also how would one make it so that it doesn't slip down your face?
You might want to look at images of “face wind masks” or “neck gaiters’’ or “scarf face masks.”
From the look of it, it’s sewn into a tube shape and worn by being pulled over the head and down around the neck and most of the face.
The images of the ones you’ll find online tend to be much more “baggy” than Korekiyo’s, which fits pretty closely to the form of his face and neck.
You’ll want to not make it as long (so it doesn’t bunch up), and also use a fabric that has some good stretch in it so it keeps its form and grip around your face/neck. Also sew that small zipper into it.
I hope this helps!-Mod Y
