Are you interested in the simple origins of the bow tie?
I have just added and article - the History of the Bow Tie - which explains the two most popular theories about it origins. Whether originally from North Africa, or Europe it has certainly become well established on every continent - and nowhere more so than in America.
The bow tie has evolved from being an item of clothing worn by a few professional and influential people to one which is now very popular amongst people from all walks of life. Celebrities who have worn the bow tie have ensured its rise in popularity.
The clip - on bow tie is one way in which the bow tie continues to change as it is adapted for more, less formal occasions.