"A neckerchief (from neck (n.) + kerchief), sometimes called a necker, kerchief or scarf, is a type of neckwear associated with those working or living outdoors, ...
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including farm labourers, cowboys and sailors. It is most commonly still seen today in the Scouts, Girl Guides and other similar youth movements. A neckerchief consists of a triangular piece of cloth or a rectangular piece folded into a triangle. The long edge is rolled towards the point, leaving a portion unrolled. The neckerchief is then fastened around the neck with the ends either tied or clasped with a slide or woggle." - (en.wikipedia.org 15.02.2020)