Its size was camouflaged by the surrounding forest and technology.
The portal was camouflaged by sand and shrubs.
While you could certainly take a weekend to drive out into the forest, set up your blinds, and put on all sorts of camouflaged clothing, it's probably more convenient to get in some hunting through some free games for Nokia phones.
Large bushes shadow Sam's presence, small bodies of water speak to enemies when disturbed, and large blades of grass can hide a well camouflaged spy.
Many of the shirts are camouflaged to allow fishermen to get closer to fish that are normally easily frightened.