Fly/Zipper/zip undone

Hi,

Sometimes there is no difference.

But, zippers are not just used for a fly. My leather jacket has a zipper, and right now that zipper is undone, but my fly isn't.

Best wishes, Clive

Thank you, Clive. So i understood that the zipper is undone but the jacket is like wrapped around you

Just to make it perfectly clear -- the fly is the opening in a pair of (men's) pants. Usually it opens and closes with a zipper, but old-fashioned pants might have buttons instead. Zippers can be used in many other places. If the zipper on the back of a lady's dress is undone, you would not tell her that her fly was undone. On the other hand, if a man has failed to zip up his pants, you could

If you want to be subtle in the UK you can say 'you are flying low' to tell someone his fly is undone.

Moon-babyCan anybody tell me please, what's the difference between Zipper/zip is undone

Zip in the UK and zipper in the USA http://dictionary.cambridge.org/dictionary/british/zip