Surely not too ostentatious when it is an original component, as on the Raleigh Record Sprint:
https://www.flickr.com/photos/543299...7688854991233/
The catalogue mentions the gold brakes, levers, cables, cranks and chain but not the gold anodised sleeve covering the visible part of the handlebars.
or shiny gold stickers. The overall impression is of a 1970's cigarette packet.

I recently acquired one that seems fully original, and ridden just enough that the chain looks like every other used chain.