I used to wear bars on my raincoat, for the simple reason that it identifies you on the ramp to all those people who want to talk to you, ramp agents, refuellers, etc.
Of course then the hi-vis nazis had their day, so now the bars are a bit irrelevant... until I can work out a way of glueing them to the the hi-vis...
Hats... wore one for the first few months in Loganair, many years ago, then gave up after the third time I had to chase it across the ramp at ABZ. Haven't worn one since, although the kids like to use them for dressing up in. Of course, if the hat was of a decent quality, I may have continued wearing it, but most of them are horrible.