Take a look at the Wisconsin deer hunt in two weeks where we have almost 600,000 hunters in the woods for a week and where we take almost 400,000 deer during that time period. Blaze orange, as we call it, is mandatory for 50% of your upper body and your hat if you wear one.
Although not required, blaze orange is highly recommended for upland birds and as a former Hunter Safety Instructor in Wisconsin we strongly recommend it. We even suggest that turkey hunters wear some blaze orange to and from the field when hunting.
And for me, when I am walking into the woods in the dark on opening morning, on public land, I will be carrying a flashlight and a head lamp. All I need is some jumpy hunter shooting before sun-up at a sound.