Disguise

Many cases and arcs involve the use of a disguise.

Characters who specialize in disguise

Many of the characters who specialize in disguise studied on a magician, and many magicians in Detective Conan also have disguise abilities.

Detective Conan vs. real world disguise

In real world, creating a facial mask may be possible, but trying to impersonate other people and not to mention in a short amount of time is more likely impossible. In Detective Conan, Vermouth and Kaitou Kid seems to change themselves really quickly (and easily) unlike Yukiko who had 7 hours of time to dress Heiji and Conan.