The official color of the sanitation worker's uniform is "spruce, " and in my duties with the department, I discovered that the outfit acts as a cloakingdevice.
The key change was the addition of copper strips to the metamaterial that shields an object from incoming light to create a better material, couple with a slight change in its orientation to solve a problem caused by dividing the metamaterial of the cloakingdevice into quadrants.
He would probably need, at the very least, a sophisticated hedge fund cloakingdevice and word has it that only Goldman Sachs or JP Morgan has one in inventory there were rumors about such a black-box development at Morgan Stanley but that seems to have been someone talking their book.