The Eagle Scout neckerchief is an optional item that further
recognizes the award. It is generally only worn at Eagle Scout
ceremonies.
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neckerchief, nylons
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That is the correct spelling of "bandanna" (head scarf or
neckerchief).
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The sash goes around one shoulder and down to the waist. Merit
badges are attached to it. The neckerchief goes around the neck and
has a ring clasp to keep it snug.