What is a French fly on pants?


Quick Answer

A French fly, also known as a waist stay, is a hidden extra closure with an inside button that is attached to an interior belt. It can be seen on both men's and women's pants, although more commonly on men's.

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Full Answer

The French fly's function is to take the strain off the top of the zipper, allowing the flap of the fly to lay down smoothly and flatly in a more relaxed way. The French fly is most often found on high-end trousers and dress pants. The top closure on the pants can either be an outside button or a flat-hook closure.

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