A short, light jacket with a zip front and often a tartan lining.
"He slipped on his favorite harrington to keep warm during the brisk walk through the city streets."
In plain English: A harrington is an old-fashioned type of jacket that was popular among young people in the 1950s and has seen some modern comebacks.
"She wore her hair in a harrington with short sides and longer, flat-topped bangs."
A habitational surname, from Old English from several places of that name in England.
"After researching his family tree, he discovered that Harrington is a habitational surname derived from an Old English place name in England."