Firearms deer hunting in my state requires hunter orange vest or jacket covering all sided, and a hat of hunter orange. Orange camo is not permitted I think there is a minimum sq inches for the vest as well.
I don't rabbit, or bird hunt anymore, but even before the hunter orange, we always wore a bright red cap to be seen by other hunters in our party.
Squirrel hunting, no orange, and usually camo. But that's not usually done with a ton of hunters in the woods.
Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!