I never see anyone donning bitcoin logo stuff. Probably because
these days you'd be a fool to wear anything that advertises you are a bitcoiner.
Might as well put a big target on your back with the words
"I'm my own bank, come and mug me for a private key or two on my smartphone...
I guess that is why attendees of conference don drab clothing so not to be a target by thugs hanging out around conferences looking for a mark to jump ...
"So, there I was walking down the street minding my own business when this thug about your size with same complexion jump out from behind some rose bushes where he was hiding and demanded my Decred wallet address passwords and stole my smartphone."
the dirty bastard cleaned me outta my tittiecoins too !!