They can’t see the orange but they can see the block of “grey”. Hence orange camo.
There’s other colors they can’t see, too. The real reason is because , it’s the law that you have to have blaze orange on. Some states have minimum amounts, and most specify a hat/vest/what have you. It’s the color for all hunting not just deer.
The law is actually very complicated, with seasons within seasons, when you have to wear it and when you don’t.
As for me - blaze orange means “I’m not your target”.
There’s so many good ideas here! I wish I could use a quarter sheet but some of these trails are tight and have brambles at the edges, I don’t want to have an accident because my quarter sheet got caught on a tree lol