As I read the WAC on hunter orange you don't have to have 400 square inches visble. You have to be wearing 400 sq. in. above the waist and it has to be visible from all sides. I would be curious if anyone has recieved a ticket while wearing a legal piece of orange, but having a backpack and/or bino harness covering some of it.
WAC 220-414-080:
(4) Wearing fluorescent hunter clothing means: A minimum of 400 square inches of fluorescent hunter orange and/or fluorescent hunter pink exterior clothing, worn above the waist and visible from all sides. A combination of both colors may be worn to meet the 400 square inches.