system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why do the Nazgul wear cloaks if they are invisible?

What advantage do their clothes provide?
gpt
Intimidation, also disguise, a cloaked figure on a horse in the distance might not raise any suspicion, a riderless horse with reigns held up by an invisible force is another matter.

Cloaks have been proven to help aerodynamics in flight.