Serious - Why are aliens (incorrectly) depicted as nude?

I'm seeing a number of posts and images lately of aliens from UFOs that aren't wearing clothing, and I'm a bit confused. What documented UFO encounter ever involved naked aliens? I can't think of one. Actual UFO sightings, encounters, and description of crashed UFO events that involve occupants always have them wearing some kind of uniform. The only (rare) exceptions are cases that involve some kind of sexual aspect, like the 1957 Antonio Villas-Boas case.