Ask the Department of Fish and Wildlife:
Can I use fluorescent hunter-orange camouflage clothing measuring at least 400 square inches to meet hunter-orange requirements?
Yes, but the amount of camouflage clothing that is actually fluorescent hunter-orange in color must still total 400 square inches or more on the exterior, and be worn above the waist and visible from all sides. This means the total size of the garment or garments being worn will be considerably larger than 400 square inches. For details, review Washington Administrative Code 232-12-055.Information for this feature comes from wdfw.wa.gov/help.