Look at my sig. I have a few choices when I wear this vest.
I have a blaze orange shirt. Long sleeve. I have a pull over wind breaker with blaze orange sleeves and top over the shoulders. I just layer up.
And you are correct that even their blaze orange version does not meet Washington regs.
But put some blaze orange on under it and away you go!!!
I do love it. Rides well loaded. I have walked 10 miles a day looking for Grouse and carried enough shells, water, food, firstaid kit and extra clothes with no problem.
Plus Bob is a great guy to deal with.
Better yet.......check this out. I have the vest on in this pic.

And this one

Just get some orange to wear under it. You will not be sorry.