Definition
A fly front is the part of your pants or jeans that covers the zipper or buttons in the front. It's basically the fabric flap that keeps everything concealed. Think of it like a curtain for your pants. Different styles exist, from button-fly to zip-fly. It's a functional detail, but also plays a role in the overall design. Like the spoiler on a car, it can add a bit of style, but mostly it's there to do a job.