What is the United States "Civil Flag"?

"We the People of the United States, actually have two national flags, a military flag and a civil flag for peacetime."
http://barefootsworld.org/uscivilflag.html

""Old Glory" or the "Stars and Stripes", the US flag with horizontal bars that most are familiar with, is actually the military flag of peacetime. The civil flag of peacetime is meant to be flown on non-military buildings and has vertical red and white bars with blue stars on a white canton"
https://www.amazon.com/Civil-Peacetime-T-shirt-Stars-Stripes/dp/B07DVMMNRF

"have a neighbor who flies a strange flag. It looks like our flag but has thirteen red and white stripes vertically. The field is white with the same amount of stars as our flag but in navy blue. He claims that this is an officially sanctioned flag for civilian use."
https://www.azcentral.com/story/claythompson/2014/11/26/flag-america-coast-guard-stars-and-stripes/19542479/

"When Nathaniel Hawthorn wrote "The Scarlet Letter," a work of fiction, little did he realize that one of his passages would generate an urban legend about a non-existing "Civil" US flag in the 20th Century."
https://www.crwflags.com/fotw/flags/us!ful.html

"US Civil Flags is seeking the restoration of a Common-Law government as defined in the Declaration of Independence and the Constitution of these united states of America; and the re-institution of a debt and usury-free Gold-based currency coined by the Treasury of these united states."
http://www.uscivilflags.org/home.html

"This flag is a very rare pieced-and-sewn example of the American Civil Flag, also known as the Revenue Cutter Flag."
http://www.rareflags.com/RareFlags_Showcase_IAS_00195.htm