Posted by: Jack Henry | January 26, 2018

The Fly

Dear Editrix,

I was wondering, how and when did the zipper in my pants get the name “fly”?



Dear XYZ,

What a curious question! Apparently, though, you are not the only one out there wondering why there’s “a fly in your pants.” Maybe I wear too many dresses to wonder about such things, but here’s the best I could find, from Wikipedia:

A fly on clothing is a covering over an opening concealing the mechanism, such as a zip, velcro, or buttons, used to close the opening. An open fly is a fly that has been left unzipped or unbuttoned.

The term is most frequently applied to a short opening over the groin in trousers, shorts, and other garments. The term is also used for overcoats, where a design of the same shape is used to hide a row of buttons. This style is common on a wide range of coats, from single-breasted Chesterfields to covert coats.


Covert Coat

Trousers have varied historically in whether or not they have flies. Originally, trousers did not have flies or other openings, being pulled down for sanitary functions. The use of a codpiece, a separate covering attached to the trousers, became popular in 16th-century Europe, eventually evolving into an attached fall-front (or broad fall). The fly-front (split fall) emerged later. The paneled front returned as a sporting option, such as in riding breeches, but is now hardly used, flies being by far the most common fastening. Most flies now use a zip, though button flies continue in use.

Note: I have refrained from including pictures of button flies, riding breech flies, and codpieces to maintain our “safe for work” G rating.

Kara Church

Technical Editor, Advisory

Symitar Documentation Services

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s


%d bloggers like this: