A collar pin (closely related to the collar bar and collar clip) is a piece of men's jewelry, which holds the two ends of a dress shirt collar together and passes underneath the knot of a necktie. Functioning in a similar way as a tabbed collar, it keeps the collar in place and lifts the knot to provide a more aesthetically pleasing arc to the necktie.
A collar pin (closely related to the collar bar and collar clip) is a piece of men's jewelry, which holds the two ends of a dress shirt collar together and passes underneath the knot of a necktie. Functioning in a similar way as a tabbed collar, it keeps the collar in place and lifts the knot to provide a more aesthetically pleasing arc to the necktie.
Source: Wikipedia "Collar pin" · CC BY-SA 4.0
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