The bow tie originated among Croatian mercenaries during the Prussian wars of the 17th century: the Croat mercenaries used a scarf around the neck to hold together the opening of their shirts. This was soon adopted (under the name cravat, derived from the French for "Croat") by the upper classes in France, then a leader in fashion, and flourished in the 18th and 19th centuries.
It is uncertain whether the cravat then evolved into the bow tie and necktie, or whether the cravat gave rise to the bow tie, which in turn led to the necktie.
The most traditional bow ties are usually of a fixed length and are made for a specific size neck. Sizes can vary between approximately 14 and 20 inches just like a comparable shirt collar. Fixed-length bow ties are preferred when worn with the most formal wing collar shirts, so as not to expose the adjusting buckle of the bow tie. Adjustable bow ties are the standard when the tie is to be worn with less formal turn-down collar shirts which obscure the neckband of the tie. "One-size-fits-all" adjustable bow ties are a later invention that help to moderate production costs.
Guys : it's time to open your Gran'Pa wardrobe, "picking" some bow tie and wearing them.