Science Fiction Trivia

[RockDoctor]

{tap, tap}
Is this thing on? {hooowlllll rowunnnnnd}
Is there anybody in there?

[Cholmondely]

This doesn't count:

https://wiki.alioth.net/index.php/Sector1/Digebiti:

Other failed exports include the silk top hat, the tricorn and the pith helmet. Whilst hat-wearing is all the rage on Digebiti itself, and hats are worn by gentlemen of all ranks and none (not to mention the ladies), the particular fashions currently in vogue have proved of little interest to the sartorially inclined in other systems. There was a run on tricorns on some of the lobstoid worlds, but when the House of Lords came to understand that they were being used as knee-protectors, the trade was interdicted in a flurry of disgust and disbelief.