Here's a precursor to the "tinfoil hats" of those shielding against mind control by governmental or paranormal forces.  In 1920s England, tinfoil hats were a fashion statement.  From Popular Mechanics, 1927.

You've heard of counting tree rings to determine the age, but did you know that the rings in Panama hats are counted as well?  Here are Panama hats being harvested, from Popular Mechanics, 1924.

Here's a mad hatter from Punch, 1863.

From Die Bühne, 1925.

From Die Muskete, 1914.   Also very much of interest: The Young Wizard's Hexopedia.

Here is revealed how magicians make time for practice.  From Die Bühne, 1925.

Talking through his hat.  From Die Bühne, 1925.

INSTRUCTIONS: Click to see the prices go up.

From 1903.

Q: "Why did Lewis Carroll?"

A: "Because Alice threw the looking-glass!"

—The Sketch, 1901

"A very seedy hard felt hat."  From The Adventures of Sherlock Holmes, 1892.

Here's a rabbit magician (a detail of an Easter postcard, date uncertain).  We had previously uncovered this giant rabbit magician pulling a man out of his hat, from 1910.

Living made easy with a revolving hat with eye-glass, cigar, scent box, spectacles and hearing trumpet, from 1830.

A precursor to Burgess Meredith as The Penguin in Batman.  From Die Muskete, 1912.

The radio hat of 1931.