Close your zip.

[tufguy]

"Your jacket's zip is open close it."

"Your pant's zip is open close it."

Please check.

 

[Tdol]

I would say the person's zip is undone, though I would only regard it as worth mentioning in the second case- the first is a matter of preference.

 

[Rover_KE]

In both cases you need a full stop (period) after 'open'.

 

[GoesStation]

In AmE, it's a zipper​.

 

[emsr2d2]

In BrE, it would be natural to say "Your jacket zip's undone. Do it up."

 

[J&K Tutoring]

Growing up in a farming community, I learned, "Your barn door's open!" We didn't care about jacket zippers...

 

[tufguy]

"Your zip or zipper is undone do it up."

"Do up your zip or zipper."

 

[Fagin]

In AmE, it's a zipper​.

What's a fly then? As in 'zip your fly'.

 

[tufguy]

"Your zip or zipper is undone. Do it up."

 

[Tdol]

Growing up in a farming community, I learned, "Your barn door's open!"

For some eccentric reason, there's egg on your chin has the same meaning in BrE.

 

[GoesStation]

What's a fly then? As in 'zip your fly'.

It's a fly, but we expend an extra word in that statement. We say zip up your fly.

 

[Fagin]

It's a fly,

I've already found it in Wikipedia: https://en.wikipedia.org/wiki/Fly_(clothing)

but we expend an extra word in that statement. We say zip up your fly.

That's useful! Thank you!