Ok I had no idea where to ask this. Anyway my question is...
You know when you have a pair of jeans, but the zipper won't stay up? Is there anything you can do about it? I thought about just using a safety pin but I think that's too noticeable.

I have used a safety pin but pin it from the inside of the zipper.
That can be about impossible if you wear your jeans really tight though.

Sometimes just making sure the zipper is ALL the way up and the tab is against the zipper can work depending how bad the zipper is.

Its pretty bad. I'm lucky if it stays up more than 5 seconds. Lol

Might need to replace the zipper

Buy a different pair of jeans? :)

I tie a piece of string round the top of the zipper and then hook this around the jean's botton at the top of the zip. It was a bit more fiddly going to the toilet but it really works.