Maybe ten years ago a friend gave me a spare hi-vis jacket. Anecdotally, I'll swear it made a difference in the amount of room and respect I got from motorists, in all conditions. Since then, I've replaced it twice as it fades out, every three years or so. I have several hi-vis T-shirts, long and short sleeve, for summer riding.

I once heard a motorist opine that he was getting "hi-vis burnout." It seems everyone is wearing it these days and it's now the norm, not the exception. I can't say I agree and I still wear mine literally all the time I'm on the road bike.

I also have lights for poor visibility conditions and the occasional night trip (once a week beer fest). I don't commute any more so I only go through maybe one set of batteries a year. Lights get switched on if I can't see my shadow, and if I need to ride in a traffic lane. Most of my riding is in sunshine and dedicated bike lanes.