As this has derailed a bit into ppe here's my 2 pennethworth. Hard heads with ear protection pretty much all the time. Chainsaw trousers with front protection pretty much all the time.
Back in the day I was all gung ho about it, but it's not really that much effort. The helmet should go without saying. As for the trousers, nice modern airy ones, one size to big, no real bother, actually more comfy when climbing for your knees and suchlike.
It surprises me that in The US, where, to be fair, most innovation and new techniques seems to originate, a lot of folks still don't bother.