Transformer clothing

One way that non-Transformer species seem to have influenced Cybertronian culture is the relatively rare occurence of Transformers wearing clothing.

Capes

Not even Optimus and Megatron are spared by the fashion

From time to time, some high ranked Cybertronians tend to wear capes. Presumably they are a symbol of office, as only generals, commanders, and other such leaders have been seen sporting them. Exactly what material these capes are made from is unknown, but one presumes that Earth-style fabrics are likely extremely rare on Cybertron (which could make the capes even more special, considering).

• Starscream wore a cape, large shoulder pads, and a crown at his coronation as Decepticon leader

• The Nine Great Demon Generals mostly wore capes, except Trypticon, who would have looked kind of silly.

• Armada Scavenger wore a large, body-obscuring cloak when he first arrived on Earth.

Trenchcoats

Quite a few characters have been depicted wearing trenchcoats, mostly when involved in detective work or similarly secretive activity.

• Nightbeat has been drawn quite a few times wearing a trenchcoat and fedora, due to their connection with detective fiction.

• The Micromaster Air Patrol wore trenchcoats and fedoras while trying to pass as human professional wrestlers. Interestingly enough, these coats somehow obscured large physical protrusions on their bodies (jet intakes, wings, etc.).

Others

• Six-Speed's curiosity about huamn clothing led him to examine the closets of his human friends Bud and Coby. However, his attempt to dress like a human basically amounted to putting random articles of clothing on his limbs, looking more ridiculous than clothing-wearing- Transformers normally do.
  
  
  From Teletraan I: The Transformers Wiki, a Wikia wiki.