The above is from Popular Mechanics, Oct., 1927. As per my previous post, Julian Huxley is believed to be the first to depict "tinfoil hats" in fiction, however he did not invent them. Paranoids have been using deflector beanies since the early 1920s when aluminum foil became widely available to the public in the form of food packaging. The Mind Control Elite, whom Huxley rubbed shoulders with, have known about them for far longer.
While the article is from over a year after Huxley's first publication of "The Tissue-Culture King" (Apr. 1926), it illustrates an already mature paranoid culture of deflective headwear use. Of course, paranoids had to pretend they were merely decorating their hats, hence the inclusion of "other fancy wrappings" with no deflective properties -- their true purpose of freeing themselves from the psychotronic grip of the Forces of Mind Control would obviously subject them to increased attention from same. That this "decorative" fad ceased shortly after it was covered in the popular press is not surprising; paranoids started putting foil wrappings under their hats to ensure discretion.