This is the main problem of stealth in every wavelength - it's easy to be stealthy in a certain direction. For example, fighter planes are only "really" stealth

This is the main problem of stealth in every wavelength - it's easy to be stealthy in a certain direction. For example, fighter planes are only "really" stealthy when an enemy is approaching them from the front. If an F-35 turns after releasing missiles, it can suddenly be targeted easily. Going back to the original topic - optical camouflage is possible, but only toward one observer, or to be more specific, from a single angle.