Doubt if this is still being read but an example of how painted/false clothing could be used for a mission:
You have to meet the contact at a given location but they refuse to talk to you if they even suspect you have hidden weapons.
One possible solution to the problem is going naked, however that is not an option as it would not be appropriate for the area in question (Hookers getting turned away from the bar being an example reaction) and that's overlooking the risks of a girl being nude in the street.
The alternate nudity solution would be going in body paint / false clothing with high enough confidence to to act like its normal clothing.