Below are the requirements here in Iowa. The requirement for the blind orange was just put into place with in the last couple years. I think blaze orange is a must for the gun seasons, if it helps keep people safe why not? Thats not meant to express that I think that the government should regulate this or that, just my opinion.
Blaze Orange Required
To hunt deer with a firearm in any season you
must wear one of the following articles of external,
visible, solid blaze orange clothing: vest, jacket, coat,
sweatshirt, sweater, shirt or coveralls. An orange hat
alone is not sufficient. No person shall use a blind for
hunting deer during the regular shotgun deer seasons
unless such blind exhibits a solid blaze orange marking
visible in all directions with a minimum height of
12 inches and a minimum width of 12 inches.