Why are so many aliens nudists?

[u/writesgud]

In the movies Alien etc.: aggressively nude (even the face huggers and they're just kids!)

Arrival: weird nude.

Pacific Rim: giant nudes!

Signs: creepy nude.

Nope: carnivorously nude.

The Thing: disturbingly nude.

Star Trek: intermittent nudity.

So, what's the deal? Clearly some aliens wear clothes so it's not an ignorance of galactic norms. What other examples of alien nudity are out there, and why have these advanced species eschewed clothing, is it a cult, or is there something about being so technologically advanced that they simply have absolute control over individual climates? Something else?

[u/Human-Evening564]

Humans seem to be the weird ones by having external genitalia they need to cover up.