To conform means to adapt to fit in with new conditions. So if you travel to Morocco, you should conform to the local custom and adjust your usual wardrobe to one that is more modest.
Sometimes conform gets a bad rap, carrying with it the sense of compromising one’s individuality to fit in or please others. But take note that it doesn’t always have to carry such a negative charge. For example, the manager of a factory that produces bouncy balls would want each ball that came off his conveyor belts to conform to a high standard of durability, bounciness, and roundness.