Punk clothing is all about doing it yourself. Taking something old and matching it into something new says more about you. Are you still confused with punk dressing? I will help you and i will share some my own ideas about Punk dressing as the following:
The central point of Punk dressing is: countering traditional culture and rebelling against what society says is acceptable or expected. So you do need to dress yourself specially and let most of the people who see you have a astonishing feeling. Because of this, your first step should be to take a look at what most people are wearing, then decide to dress in a way that reflects your objection to these standards. I will give you a example to help you understand me:
If you want to be Punk women, you should dresses in such a way as to express your personality, not to dress like what society says is beautiful because the common women dressing femininely and in ways accepted by our society. You should look for clothing with wild colors, unusual prints and combat boots or crazy heels.