Devils advocate but if it comes down to mandatory hi-vis, perhaps even enshrined in law rather than just perhaps highway code guidance, would we judge other people on bikes to at fault if they have an accident and are not wearing it? Is it really just a fashion choice that people don't want to wear it or are they being deliberately obtuse? (not aimed directly at you BTW)
My own experience is the same - when in a none fault RTC on my bike I was consistantanly asked if I was wearing hi viz. I now wear it all the time as I can't be bothered with the agro if I am in another RTC.
I would imagine that they'd have to introduce a minimum standard for the hi vis to meet if it was made a legal requirement.
Something I note is that I often see people cycling or walking wearing the sort of hi vis jackets and tabards that are aimed at building sites, but they are often so worn or dirty that the reflectives probably aren't very effective anyway.
It seems to me that a car driver is never in the wrong in Ireland and it's always someone else's fault.
There was a case a few years ago where a driver came around a blind corner too fast and rear-ended a tractor in the dark and killed the tractor driver. It was confirmed that the tractor had two working tail lamps. The driver admitted driving over the speed limit. The tractor was a late 1960s Massey-Ferguson 135. When it was built, the only lighting requirement would have been two red lights to the rear. Several other drivers confirmed seeing the tractor taillamps and overtaking safely. The driver of the car that hit it claimed he didn't see it until he heard the bang during the impact (I don't buy this as you ought to be able to see it even without lights if you have working headlamps. You might see it too late, but you should still see it).
The court ruled that the tractor driver was 75% responsible for not having a flashing beacon. I think this was an utterly ridiculous decision and worrying, because if it can be applied to a tractor, the same logic would be applied to a speeding driver that went around a blind corner too fast and wiped out a cyclist.