Answer:
I am commonly abbreviated to H
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
Skirts for men.
When I am caught, I am thrown away. When I escape, you itch all day. What am I?
I am the minerals vital for your good health.
The answer I give is yes, but what I mean is no. What was the question?