This one is simple enough to describe but not simple enough for me, a humble wheat farmer, to do.
You know how there's specific overlays for when your jumpsuit or gloves or shoees is bloody?
we need another overlay for when it is covered in... brown paste.
"why not use the extant overlays and tint them brown the way blood is tinted to your blood color" because then how will you be able to see the jumpsuit is covered in blood *AND* ... dirt?
so basically take the blood overlay, change it, brown, you know.
Anyway.
... maybe we can get away with just mirroring it but idk probably not.
You're the spriter, not me.