A commonly used real world disguise is… sunglasses! Tinted glasses that cover the eyes and a significant portion of the eye sockets are often enough for minimalist disguises used by intelligence agencies and criminals alike. The current line of various mirrorshades might be able to be modified to be used as disguises, much like helmets.
These should be weak disguises that are meant to be paired with other items that can enhance the overall disguise, such as makeup and wigs or haircuts.
