quoting meficat:

@Jipí: My trousers have a metal button and sorta rivets. Will I have to take them off?

I want to sarcastically answer that they want you to go through security naked, but no. Little things like buttons don't seem to matter. However, a mere 3 decorative rivets on each of my shoes made the alarm of the metal detector go off and I had to get a complete pat-down.