Stealth is the practice of being able to move around without being detected, as used by the tribute Foxface. It is also used in the making of hovercrafts, and stealth can be camouflage without needing to apply things to your body. Stealth is only as helpful as the skill of the person who attempts it. Foxface never really blew her cover until she accidentally killed herself, eating deadly nightlock berries by mistake. She managed to steal from Katniss Everdeen, and from the Careers in multiple different ways, using her skill in stealth.
However, this could go horribly wrong if the user was caught, as most tributes who were using stealth probably wouldn't have many, if any, supplies. If they failed, they could risk starving to death rather quickly.
Stealth was a tactic used frequently by the Capitol, its main use for stealth being the hovercrafts used throughout Panem. Stealth is different from camouflage in that the former permits mobility, all at the cost of the tribute in question becoming more noticeable as he or she moved.
Advantages and disadvantages
Tributes often avoided confrontation by hiding in plain sight. This way, they could safely observe their targets at a fair distance without making their own presence obvious. Cato also used this tactic at the time of a feast, as he watched the surrounding area while Clove went in for their bags. The hovercrafts used in Panem can also turn invisible when needed.