A deerstalker is an old-fashioned hat with parts at the sides which can be folded down to cover the ears. Deerstalkers are usually worn by men. a type of soft hat with pieces of cloth that cover your ears
A type of men's headwear, made of cloth with a plaid pattern, having two projecting brims (one at the front and one at the back) and earflaps which can be folded up and tied at the top
Two famous fictional characters who wore deerstalker hats were Sherlock Holmes and Holden Caulfield in J. D. Salinger's Catcher in the Rye.