Some of my trousers can't keep the fly up. It's annoying and sometimes awkward to get it up, particulary in public. How can I prevent them from opening while walking? One solution I already know is to fix it with a paperclip, but then, when I go to the restroom, I have to "unlock" this fixture which is annoying again.
Originally asked by jawo on Stack Exchange (lifehacks) (CC BY-SA 4.0).
